So what happens when I root again and flash a rom and I receive notification for the official updated?
What's the process then
That depends. If you want to stay on the modded ROM then you just wait a few days for the dev to update it then you should just need to flash it as per before.
If you want to go onto "official" JB from Samsung then you need to reflash it back to stock before plugging it into KIES or, alternatively, you may find that someone will upload the FW which you can use ODIN to put on without reflashing to stock OR there may be a stock Nandroid image made available.
TBH, if you are happy with the modded ROM and all it's tweaked settings, I would just wait till the Dev updates it which won't take long. You shouldnt have to reset your phone either once flashed.
What ROM are you on? I am getting an itchy finger for Wanamlite TBH. I have it ready to go but just keep holding out for official JB for some reason
Edit: As for that Turkey Rom shown above.... Christ on a bike I feel queasy
![Frown :( :(](/styles/default/xenforo/vbSmilies/Normal/frown.gif)