Im on PS3 so i can't get any of the spells im about to mention, but...
Bethesda should take some of the ideas that Mindas Magicks came up with. He has some awesome spells.
I also am hopping for 2 or 3 new shouts. One of which is the Apocalypse Shout that Alduin Uses... its Chaotic, which is perfect for evil characters who have no mercy, and don't care about calateral damage. (My guy is a good guy

)
I also think a cool Shout would be an earthquake that last for 10 - 20 - 30 seconds, and keeps all enemies and allies staggered expect you and other big guys (i.e Dragons, Giants, Mammoths, Flying Creatures of any sort... etc.)
And the Last shout i would like to see is one that summons a specteral horse, that is really fast. (This could be a spell)