In case this helps someone else I will post my experience with Access Point and these updates.
I have a Rogers Lumia 920 running on Bell. It was one of the originals sold that came factory unlocked. When 1308 was available I immediately updated and had no issues
Then I was prompted for 1314 and of course updated.
After any update I have found that I need to go to Access Point and switch from Bell to Virgin and back to Bell for MMS and Internet Sharing to work.
After the 1314 update when I switched to Virgin Access Point shutdown. It just went back to the setting menu, I went back in and neither Bell nor Virgin were active.
I selected Bell and the same thing happened.
I rebooted my phone, no change. Soft reset, no change, tried adding and removing apn settings, no change.
Now, my wife has an AT&T Lumia 920 unlocked and running on Bell and she had no problems with the 1314 update and Access Point.
I decided to factory reset my phone and figured that re-installing Access Point once I had done so would work, since I would already be on 1314.
This brought up an entirely new issue. The never-ending-gears-of-death. Supposedly this is common and can take up to 8 DAYS to resolve on its own. It has something to do with how much data you have on the phone.
I had a lot of music, etc... and I wasn't about to wait 8 days for a reset to finish. Instead I used the Nokia Care Suite to download and flash 1308 onto my phone (1314 wasn't available for some reason). Then, when that was finished I updated OTA to 1314. Then I installed Access Point and all is OK!
I was OK doing this, this time. However I will be a bit more hesitant to install any future updates as I don't want to lose Access Point again.