New firmware coming
After reading through a couple press releases, I found something very interesting in the PlayStation Plus press release. At the bottom of this press release it says:
"PlayStation users can purchase PlayStation Plus membership through PlayStation Store on PS3 only. Users need to install PS3 system software version 3.40, which will be released on June 22nd, to enjoy PlayStation Plus."
So it looks like PS3 owners will be receiving a new PS3 firmware update June 22nd. It would also make sense that this would be the update which would include cross-game chat.
I guess sony thought all these things weren't worth E3 stage time.