To elaborate, there are 2270 delegates who will choose the next standing committee. But those delegates will have been told who to vote for. Premier Wen, former Chairman Jiang Zemin, and other powerful members will have strong opinions, and may be unhappy with the make-up of the next committee. A deal has presumably already been struck, but that doesn't mean they can't possibly have a change of heart. The current leadership is leaving, and the new ones aren't entrenched, so it's a delicate situation.

Chairman Hu retains control of the military for the next 2 years, to discourage things from getting all Game of Thronesy, but they don't want to take any chances.