I'm interested in the "theater of the mind" (or "no miniatures") rules, as those might port well and work with the game I already run (which has little to no miniatures).
I voted "Other"-- for me, it's where the heroic characters of 4E meet class-specific mechanics ala 3E meet streamlined rules and combat meet the character and campaign possibilities of Icons, Backgrounds, and One Unique Thing-- it's hard to choose just one!
Oh yeah, so many things in 13th Age would have made so much sense in D&D Next. Frankly, I think WotC should just steal the background mechanics wholesale and call it their simple skill system.