I know it's kind of a wild dream, taking into account it's something that didn't exist in the previous games and spells are evolving in the oppopsite (simpler) direction.

I'll ask anyway: Do you know if there will be a spell per summoned creature (as in Oblivion)? Or the summon creature is a single spell and the creature it summons is just a parameter of that spell.

I think what your describing is no different to what is in :confused:

?

Pretty certain what you summon depends on the spell you cast. This hasn't been confirmed, but it really wouldn't work any other way.

Single spell for each summonable creature I imagine, as it has always been.

I'm hoping that the Conjuration perk tree as three branches, one for 'general' Conjuration perks, one for Necromancy and one for Daedra.