Yeah I'm excited to see them as well, and I'm pretty sure an Imp-II is coming, and hopefully the ship which the stats indicate is a Vic-I but is named a Vic-II are a sign that they plan to include the Vic-II in a later book and someone got which one was in this book mixed up rather than a typo
I'm surprised there wasn't a GR-75 but given that it already appear in EOE, and that there's IMO a good chance of it appearing in Assault on Arda I based on what we know of that adventure's events, and they probably saw no need to print the stats again. Also they were likely running short on space.
As for the MC90 I wouldn't expect to see it in an AOR Product. Unless they change the BG it didn't appear until five or six years after the Battle of Endor. Maybe it will show up in the sequel trilogy, and an ST sourcebook though.