I heard that Zaheer is going to traded for Uthappa by the Challengers, which would be a moronic decision on the part of the Bangalore think tank, but anyways i think Bangalore really just need slightly better planning this time around and they would do well, because they certainly have the caliber of players to do the job for them, you mentioned Bracken who is a fantastic bowler, he would be welcome addition for them, but i think they also missed a trick, in the way which they used a guy like Cam White last time around, he is one of the most experienced and dangerous T20 players around in the world, and they would have been better served had they utilised him in a better way.
The Challengers would have to bite the bullet and make some ruthless decision, likes of Kallis, Chanders, Jaffer, Dravid just aren't T20 players, and Dravid is a icon player so they can't get rid of him, but they seriously need to think about the rest of them.