I saw at 10:22 On the New G4TV Trailer For Skyrim the Dragon Priest summoned a Frost Atronach and the look of it had changed instead of appearing in a purple void it appeared out of the ground with a blue aura, Maybe every creature has a Unique Summoning Animation

Hopefully, would make it more interesting.

cool info revealed in a few articals say conjuration has a perk to allow the dovahkiin to summon two atronach at same time ,i hope its for all summons ,there is also a nocromancy perk to revive zombies ,i havent see full perk tree of any mage school yet -_-

I really cant wait for this game damn, I wasnt much into magic, but Im really glad for the guys who like the summoning abilities that they can summon several "things" now, instead of having to mod it in before (if you were on PC)

Overall it looks like it really is their "gem"