It's finally up as an OTA! the questions are:
1) Can I revert back to 6.0 if anything goes wrong? (By restoring a full update taken with TWRP).
2) Will I still be rooted after applying the update to 7.0?
3) It suggests a factory reset after the update. Will it be ok to restore my apps that have been backed up with Titanium backup after this factory reset?