1099 Misc Question

How big of a difference?

Either way, you should probably just wait.

You can file your return reporting the actual amount you were paid, but there is some risk if the amount you report is less than the amount reported on the corrected 1099-Misc you will receive. I'd fill out the return using the amount of nonemployee compensation you received, but hold off filing the return until you receive the corrected 1099-Misc to make sure you are reporting the same amount of income on Sch. C as reported to you on the 1099-Misc.