How come so little is known about one of Skyrims most wise and powerful mages? (living) He is Archmage after all.

Most of the mages, especially Savos Aren, are pretty secluded inside the college.

He has one of those captivating names you just want to know more about.

Nope just some dude that studies in the college really, the main quest does expand on his backround a little bit though

Really? I'm looking forward to it then.