At least one of those GameStop eXpo rumors turned out to be true: Square Enix has confirmed in a press release that Kingdom Hearts Re: Chain of Memories, a PlayStation 2 remake of the Game Boy Advance title, is coming to the US on December 2.
The PS2 version has been available in Japan since March 2007. It will retail here for $30 and includes voiceovers from Haley Joel Osmont and David Gallagher. As a friendly reminder, PS2 titles are only going to work on select older PS3 models.