Any chance we will see any new spells, not just for Vampire Lords?

and any guesses of what new items we may be getting? or rather the amount of new items and unique items?

I would like to see some sweet new helmets with cool enchantments, vanilla skyrim left me wanting in the way of unique items with nice enchantments.

hard to say, i would guess we won't be seeing much. i have this feeling that they are saving "Magic" for a future DLC

At the very bare minimum we can expect crossbows (don't know how many variants), bolts, new arrows, Dawnguard armor (the video seems to show two sets - heavy and light) and Vampire Lord clan clothing, Dragonbone weapons, a Summon Mount spell and the "Tear Soul Out" shout.
It's not outlandish to think that the Dawnguard and vampires can teach you some other new spells as a perk of joining them, but that's just speculation.

My guess is that there will be different armor styles available. New weapons have been confirmed as well. Well considering my experience with the Elder Scrolls games, Bethesda loves to give us a lot of new items in DLC. (Knights of the Nine, Shivering Isles, all the DLC for Fallout; they pretty much all contained new items, weapons and armor)