Sadly, not any noticeably new footage was included.
The PlayStation Blog has released a developer interview with Creative Director Tom Jones at Guerilla Cambridge, the developing team behind Killzone: Mercenary, the upcoming Vita instalment in the Killzone series. The video doesn’t provide new footage (most of it seems to be cut from the latest trailer) but goes more in depth of the developer’s perspective on several aspects of the game, inter alia, how the role of the player as a mercenary influences gameplay (the answer is money) and how the Van-Guard aids the player in disposing of enemies. The video also showed there are tons of weapons to be acquired in the game.
Watch the full developer interview here: