According to Robert Bowling, the first patch for Modern Warfare 2 is going to be “a big one”. He hasn’t revealed any details yet as to what this patch with include or fix (or both) but he took to his Twitter account to say:
First title update will be a big one. We’ve been taking notes since release and working. I’ll post details before it ships.
We’ll bring you all of the patch’s features as soon as they are revealed.