So far, that Infuse 4G IMEI is still what is registered to my line, and thus far I have had no issues whatsoever with using my Note. No texts of doom, nothing. Just a great experience so far. Hopefully it will remain this way for the foreseeable future!!
I'm posting this as an interim solution (in addition to backing up your /efs folder and deleting the contents of the original) for those of you having problems until AT&T gets the real issue fixed. Just FYI