I expect SCEI's projects to be shown off at TGS, particularly Team ICO's next game.
SCEE will probably have a heavy presence at Leipzig, where we may find out whatever Sony Liverpool is working on, and more Killzone 2 stuffs (online, etc.).
Of course, we could get more from E3. It is by no means over. Super Smash Bros. Brawl was announced on the last day of E3, remember.







