Yeah, game actually has a chance of being cool. It's a time point in Transformers lore that hasn't been looked at very closely other than the
amazing War Within comic series. I've always been a fan of Cybertronian alt modes, so this game is already getting points in my book for the art style and "reimaginings" of the characters. Unlike with most of movieverse, you can instantly tell who these guys are at a glance. Now, gameplay is another matter. Who knows. I will say I enjoyed the hell out of the PS2 Armada game, despite HATING the show and being pretty apathetic towards most of that lines toys.
I'm already drooling with hope for toys of some of these though. Always been upset that the closest we've got to WW figs were those

tarded Titaniums. Don Figuera's designs deserved better...
And in terms of voice actors, yeah, a lot of them have passed away, but that doesn't mean we're out of luck. If anyone here watched Animated, you know what I mean. Animated Starscream (Tom Kenny) was an amazing "adaptation" of G1 screamer. Not 100% the same, but the voice actor took what Chris Latta had done and made it his own. David Kaye (Beast Wars Megs, Animated Optimus) did a really great job with Grimlock as well. Other great voice cameos included Wierd Al as Wrek Gar (nice nod to the fans).
From G1, we can still get (and I'm pretty sure the voices will be ~ the same)
Peter Cullen - Prime and Ironhide
Frank Welker - Megatron, Soundwave, Rumble
John Moschitta (aka, the matchbox cars guy) - Blurr (reprised role in Animated)
Michael Bell - Prowl, Swoop, Sideswipe, among other lesser characters (can still do all the voices for sure)
Leonard Nemoy - Galvatron
Judd Nelson - Hot Rod / Rodimus Prime (idk about voice here)
Casey Kasem - Cliffjumper
Erik Idle - Wrek Gar
Susan Blu - Arcee (reprised roll in Animated)
Corey Burton - Sunstreaker, Shockwave, Spike, Brawn (reprised Shockwave in Animated)
Gregg Burger - Grimlock
And I'm sure others. If done right, voice actors are the least of our worries.