Depends on what you what you do after root. If you root and stay completely stock then you will get the update. If you throw a rom on your phone then you wont, but you can always odin back to stock to get the update and re-root or wait for a new rom to come out that is based on the update.
If I just do the one click root and flash no ROMs though, I will be fine to update my phone to Gingerbread from Sprint?
I also just downloaded the wifi tether app to get free internet for my laptop!
