As I tried brewing control decks, I came to a conclusion that decks have to slant toward tempo to have a chance in the current metagame. Of course that might change after Worlds... Previously, I was interested in Solar Flare, but I'm now seeking alternatives in the Esper combination.
If only Chrome Mox is unbanned... The problem with UBW is that the best cards are usually at least 2 mana, but the power is usually concentrated in 3cc. It might have an uphill struggle against Zoo and Affinity which have a strong early game.
Just throwing ideas out there. Good luck with your deck building.