There's been an official announcement regarding the upcoming 1000th episode of the DC anime.
https://www.ytv.co.jp/conan/1000th
Here's the translation, courtesy of Spimer:
"1st round of the project to celebrate 1000 aired episodes!
Guess the great episode that will be rebooted!
The anime that began airing on 1/8/1996, 'Detective Conan', will enter its 25th year on 1/2021!
The 1000th episode will finally be aired on 3/6!
To celebrate the fact, we've decided to reboot episodes very famous, even amongst fans, for being 'legendary divine episodes'!
Reboot is restarting.
We're going to 'rewrite anew'.
The 1st round of the project, to remake anew with the latest staff, product team and technology, those products considered 'legendary divine episodes' within the series!
What kind of 'divine episodes' are going to be rebooted!?
We also unveil a special collage visual made by combining scenes screenshots from popular episodes!
There's scenes of the 'legendary divine episodes' that will be rebooted hidden here, too!
All of the visuals are hints of the 'rebooted divine episodes', indeed!
Using the hashtag #コナン神回 (Conan divine episode) and make post your deduction in SNS!
There's also a present campaign for a special collage visual, too!
Check the details in the official account!"
There seem to be six of these "collage visual" images. So far, three have been revealed—Shinichi, Kid and Heiji—while the other three remain unrevealed.
The above is the info we've been given—what follows from me below is my own speculation on the cases we could be getting:
So we'll be getting "legendary divine" cases with Shinichi, Kid and Heiji as the prominent focus for each... these cases will probably be from DC's first half (Manga: 1994–2007/Anime: 1996–2008), considering the animation distinction between the Kenji Kodama/Yasuichiro Yamamoto/Masato Satō era (1996–2008) and the Kōjin Ochi/Yasuichiro Yamamoto/Kobun Shizuno/Chika Nagaoka/Yuzuru Tachikawa/Nobuharu Kamanaka era (2008–present), and also considering the legacy status of the cases of the series' first half—especially the cases from the first few arcs of the series (Conan arc through Vermouth arc, in particular)—I'd say the episodes we could possibly get, for each of our stars so far, are:
Shinichi
- Diplomat Murder (File 92–File 96/Episode 48–Episode 49)
- Shinichi's Kudō's First Case (File 204–File 207/Episode 162)
- Desperate Revival – The Black Knight (File 254–File 257/Episode 190–Episode 191)
- Desperate Revival – The Promised Place (File 258–File 260/Episode 192–Episode 193)
- Golden Apple (File 350–File 354/Episode 286–Episode 288)
- Rotten Apple (File 429–File 434/Episode 345)
- Yuki-Onna (File 518–File 522/Episode 490)
- Shinichi and Ran's Childhood Adventure (File 570–File 573/Episode 472–Episode 473)
Kid
- Black Star (File 156–File 159/Episode 76)
- Magic Lovers Murder (File 192–File 196/Episode 132–Episode 134)
- The Sunset Manor of Renya Karasuma (File 299–File 302/Episode 219)
- Miraculous Midair Walk (File 453–File 456/Episode 356)
- Eccentric Mansion (File 475–File 478/Episode 394–Episode 396)
- The Four Masterpieces (File 544–File 547/Episode 469–Episode 470)
Heiji
- Diplomat Murder (File 92–File 96/Episode 48–Episode 49)
- Holmes Fanatic Murder (File 117–File 121/Episode 57–Episode 58)
- Bond of Flame (File 150–File 153/Episode 77–Episode 78)
- Stabbed Wallet Murders (File 185–File 188/Episode 118)
- Cruise Symphony Serial Murders (File 225–File 230/Episode 174)
- Tottori Spider Demon (File 246–File 250/Episode 166–Episode 168)
- The Lying Client (File 276–File 278/Episode 220–Episode 221)
- And Then There Were No Mermaids (File 279–File 283/Episode 222–Episode 224)
- Naniwa Swordsman (File 314–File 316/Episode 263)
- Tiger Scroll (File 317–File 321/Episode 263)
- English Teacher and Great Western Detective (File 341–File 343/Episode 277–Episode 278)
- Island of the Dragon King's Palace (File 361–File 365/Episode 291–Episode 293)
- Heiji and Kazuha's Desperate Situation (File 390–File 392/Episode 323–Episode 324)
- Red Horse (File 393–File 397/Episode 325–Episode 327)
- Rotten Apple (File 429–File 434/Episode 345)
- Heiji Vs. Kazuha (File 441–File 444/Episode 381–Episode 382)
- Miracle at Koshien (File 445–File 449/Episode 383)
- Conan and Heiji's Deduction Magic (File 487–File 490/Episode 406–Episode 408)
- Yuki-Onna (File 518–File 522/Episode 490)
- Phantom Corpse (File 459–File 461/Episode 479)
- Detective Koshien (File 462–File 466/Episode 479)
I've highlighted in bold the ones I think we're most likely to get, struck through the ones we're not likely to get, and left without highlight those I can't rule out but don't find as likely as the bolded ones.
Above all, I think the case introducing Karasuma will be adapted—it'd be the most surprising for me if that case isn't going to be adapted. Likewise, the Mermaid case's odds of inclusion rise, given its own connection to the BO plot, which likely means the case that leads into it would likely be included, as well. As for the other 4 Heiji doubleheaders, it's hard for me to say which one would be most likely to get adapted. I think Heiji's intro case, considering both his and Shinichi's roles in it, is very likely to be adapted.
Of course, this doesn't account for the 3 characters in the "collage visual" images who haven't been revealed, yet. The reveal of the remaining could lead me to unstrike some cases or give others a bold highlight, because while Shinichi, Kid or Heiji may not make their inclusion likely, the presence of another character could (i.e., if Vermouth is one of the 3 as-of-yet unrevealed characters, the Rotten Apple case becomes far more likely; if Ran is one of the 3 as-of-yet unrevealed characters, the Desperate Revival cases become far more likely).
Also, this list and speculation are based on my assumption that any case made after Clash of Red and Black (Episodes 491–504, the final episodes directed by Masato Satō) will not be adapted by this reboot/remake project.
“Life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really mere commonplaces of existence. If we could fly out of that window hand in hand, hover over this great city, gently remove the roofs, and and peep in at the queer things which are going on, the strange coincidences, the plannings, the cross-purposes, the wonderful chains of events, working through generations, and leading to the most outre results, it would make all fiction with its conventionalities and foreseen conclusions most stale and unprofitable.”
“Education never ends... it is a series of lessons, with the greatest for the last.”
― Arthur Conan Doyle, The Complete Adventures of Sherlock Holmes and His Last Bow
"I have decided to stick to love... hate is too great a burden to bear."
— Martin Luther King Jr. (A Testament of Hope: The Essential Writings and Speeches of Martin Luther King, Jr)