Does this root still allow OTAs?
Historically the way root is achieved on Samsung devices your applying a custom recovery via Odin and flashing a modified kernel to allow root access followed up with flashing Superuser. So in most cases as long as you don't change the stock ROM other than what is needed for root access/Superuser it will still receive official OTA updates.
Two things that could happen if it accepts the update.
1. It may fail on installation due to the custom recovery. Not a big deal there is always a work around for this.
2. If it does take, you may loose root and have to redo the process over once updated.