Default blizzard UI hasn't changed since the original WoW(except minor adjustments). I'd love to see something new, or maybe even different choices for a blizz ui in Cataclysm. Seriously even that thing they used to display arena tourney would do.
Theres a lot of addons - I agree, BUT I want to see what blizz is capable of making.
GIEF.NAO.PLOX.