We've been to parts of Oblivion and sure there is more realms that can be explored... but what about Aetherius, will the Dragonborn get to meet the God behind his Demi-God ability, and if not perhaps on the new gen consoles for TES VI.

P.S. I've always thought of the Eye of Magnus as Magnus counterpart to Lorkhan heart, and that it could be used as a conduit for apotheosis.