Tetsuya Nomura posted a little bit of news regarding the SE Party over at the ShinRa site. This is what he revealed:
-There will be a FFVII Compilation and Kingdom Hearts II booth that will feature a, roughly, 8 minute trailer comprised of footage for KHII, Before Crisis, Crisis Core, Dirge Of Cerberus and finally for the 7 minutes left will be for Advent Children since this is the last major show for film before hitting the Venice Film Festival and stores worldwide. He mentions that this trailer will not be on the AC DVD.
-3 titles will be playable at the show including Kingdom Hearts II, Dirge of Cerberus and a third title that will be a "world premiere".
Aside from that he mentions preorders for the Limited Pieces edition of AC have exceeded the number of units they planned to produce and that they're still talking about the possibility of AC having a limited theatrical release.