Yea I was wondering that too, cause I was watching comic con and like halfway through the Littlebigplanet karting beta, the stream stopped amd i was wondering like what happened. What were that gonna reveal at the time? cause wasn't the actual Superbot pannel for all-stars gonna be on the 15th, not today?
Me and a couple of other forum members were there live for the entire stream and it never aired...Stupid Gamespot messed up there stream and went offline like 20x and they completely ended up skipping the entire PSAS segment. However SuperBot responded and said to basically catch up with them on Sunday at ComiCon and they will do the're show then.
Gamespot's interview with SuperBot's dev didn't air for whatever reason but during their live cam tour of Comic-Con, they showed about 2 minutes of PSA footage from the booths. Nothing new was there, no new characters, no new stages and no new items from what I could see.
Here's the live show where the PSA part got technical difficulties through its entirety:
Here's the live cam tour. The PSA showcase starts first at around the 1 hour, 14 minutes mark and then a second time at around the 1 hour, 17 minutes mark: