Regarding the inclusion of Christopher Reeve in Crisis On Infinite Earths, that is unknown, but what is interesting is that back in October of a year ago saw Jack O'Halloran, who played Non in the Donner movies, confirm that there is a plan to bring back Christopher Reeve as Superman in hologram form.
Breaking down the many Earths of the Multiverse ahead of the big crossover event. The new story, which will be penned by Marv Wolfman - who wrote the original "Crisis on Infinite Earths" in the 1980s - and Marc Guggenheim, who is spearing The CW adaptation. The new story will be part of a 100-page book that will feature a reprint of the original "Crisis on Infinite Earths" Issue #1, and an excerpt from issue #7. "The comics will enable us to include characters and concepts that couldn't be included in the crossover, plus the chance to collaborate further with original Crisis architect Marv Wolfman is just icing on the cake". The second issue will be released January 19, a few days after the January 14 two-hour finale. Issue #2 will also feature the main and back up stories co-written by Wolfman, Guggenheim, with art by Derenick, Scott, Andy Owens, Hi-Fi and Abbott on the main story, with Grummett, Miki, Sotomayor, and Abbott on the back-up story. Reprinted content will also be included, in the form of issue #8 of CRISIS ON INFINITE EARTHS, plus excerpted content from DC UNIVERSE: LEGACIES #6. DC Comics announced Thursday that it will put out a new, two-issue "Crisis on Infinite Earths" comic that will tie directly into the CW's upcoming mega-event.
"Crisis on Infinite Earths" will begin with Part 1 - "Supergirl" on Sunday, December 8 at 8.00pm ET/PT, Part 2 - "Batwoman" on Monday, December 9 at 8.00pm ET/PT, Part 3 - "The Flash" on Tuesday, December 10 at 8.00pm ET/PT, Part 4 - "Arrow" on Tuesday, January 14 at 8.00pm ET/PT and Part 5 - "DC's Legends of Tomorrow" on Tuesday, January 14 at 9.00pm ET/PT. Fans can stream each episode for free the day after air on The CW App.