I don't know if it's the full Final Mix+, or just Re:COM...
But we are getting Re:Chains Of Memories in the USA.
I've even been told the character artwork they are showing is the generic 'CGI Pose' of the Organization members that are up at damn near EVERY Kingdom Hearts fansite.
Square EnixSquare (or Disney, not sure), have been auditioning TONS of people for the last few weeks for voices of Organization XIII members (Vexen, Lexaeus, Zexion, Marluxia, and Larxene) saying the game is 'Chains of Memories'.
The casting people/paperwork are/is specifically calling it 'Kingdom Hearts Chains of Memories' and are SPECIFICALLY casting the 5 Organization members that I named in the article, all of whom were in CoM and don't have cast English voice actors (outside of those 5 I don't know if anyone else is being cast in any fashion, although I THINK those were the only 5 characters who are in CoM who don't already have English actors from KH/KH2).
So while it is possible they are being cast for 358/2 Days, the 'name' being told to people in the auditions is specifically CoM, I've reconfirmed that specific fact with quite a few people who auditioned and it has been consistent between them all."