New Vehicles: New variant Landspeeder , the Tempest. New Variant Predator with Plasma. Raven claw air
New Characters: Three new characters Belial, Namaan, and Asmodai. All in a new codex and not a WD
Lots of Plasma and new weapons. Dark Angels get a reroll save against gets hot. New special weapons
Dark swords and Dark Claws.
Let's see if these have any merit after GW put gel seals on the pre-release goss wagon. With only a week or so to go before the next big release, I'm actually super excited to see Dark angels and I play High elves, not Dwarves though.
Edit: You ask and you shall receive. More info has come out about the new release, thanks to Faeit 212. You can find it here http://natfka.blogspot.co.nz/2012/12/dark-angels-units-details-from-wd.html.