You will still have the option of an OTA update or updating via iTunes. The "official" release will be the same as the GM version. But I also expect a fix/patch/update within the first couple of days to fix some of the bugs found in the GM version (there are ALWAYS bugs, even if they aren't major or problematic).
Originally Posted by jon01
Also, the OTA updates are only for minor updates (5.01, 5.02). I am hearing/reading that the "point" updates (5.1, 5.2, etc) will be iTunes only, NOT OTA.