I took 66.7% for mine earlier this year. Right now I think they are 80%. But talk says that MF Global customers will get ALL of the money back, so 90% sounds realistic.
I would recommend selling your claim--trade and make more money than holding onto it. If you don't sell your claim, you are buying a claim by predicting you will get all of your money back. I don't think anyone here wants to be a claim buyer.