According to this GamePlasma report, Gamestrailers is going to publish the first gameplay video of Resistance 2 single-player and multiplayer this Friday, June 13th, at 1.00am EST in HD.
"We're thrilled to debut the first gameplay footage of Resistance 2 on GTTV. The team's hard work on the game is really paying off, and we're excited to see our fans' reaction to the footage," said Insomniac boss Ted Price. "It's exciting to not only be able to show footage from our single-player campaign, but from our 60-player competitive multiplayer mode, Skirmish, as well."
Apparently this came from a press release, but we can't find it and there's no link. Just have to trust your luck, innit.