They better add summon dragon priest. Conjuration is fugging lame as it is. Master spells are all basic atronachs we've seen at low levels, wtf? Where's my xivili or giant gator thing?
Daedroth, and yes, the selection of spells not only for conjuration but for destruction (and others - water walking? open chest? etc) is quite sparse as it is. There better be additions, because if not vanilla Skyrim will be terrible for mages. We always have mods, but they shouldn't have to compensate for developer oversight.