The CPU runs at 1.2GHz (up from 624MHz) and the RAM amount went up to 768MB. This increased processing power allowed RIM to put a 3.2” VGA screen with excellent viewing angles on the BlackBerry Torch 2 (double the pixels of the 3.2” HVGA of the original).
The video camera records 720p video, though the still camera is still a 5MP unit. The rolling shutter effect is a problem it seems, at least for the pre-release unit tested. Other changes under the hood include 8GB internal memory (expandable by microSD cards) and NFC support (though that couldn’t be confirmed).