Remember that Android 2.3.6 update to the AT&T Samsung Infuse 4G that was prematurely announced last week before finally getting going? Yeah. It's on hold, apparently. According to an answer in Samsung's support forums, things didn't go quite as planned.
We currently have put a hold on the update. Samsung and AT&T are aware of the issue with the Infuse 4G Update and are developing a fix.
AT&T has confirmed to Android Central that indeed the update's on hold and that "we are working with Samsung to get this resolved as quickly as possible." For everyone (including us) still stuck on Froyo, hang in there.