I don't think there will be a 4.1 for the 77xx models. They barely have enough memory to run 4.0 as it is. 4.1 probably wouldn't fit.
We're looking to phase out the 7750 anyway, since its so excessively slow in pretty much every regard, and has terrible battery life. We're either going to switch our 7750 (and 6750) users to 7250's from Verizon, or 7290's from Cingular, both of which can handle 4.1 without a problem. You loose the bigger screen, but it doesn't really have anything else going for it.
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