Got the N10 4.3 update just fine on a rooted and unlocked device this weekend. I lost root however recovered it. The whole process including update took about 15 minutes. Search my posts on how I recovered root.
Yeah, it normally will - even if you're rooted. In my case, I was using a custom kernel (Franco Kernel); which happens to modify some system files. In order for the OTA update to function properly, I had to flash the stock system files and recovery (which wasn't affected, but just wanted to be sure). My Nexus 4 is on 4.3 - my Nexus 10, I'll probably get to 4.3 later today. I just wasn't in the mood to flash stock system/recovery files again. No, neither devices were/will be wiped (just pushed the files without the -w [wipe] tag).
I'm confused as to how you got the OTA update. I thought if you were rooted, you had to unroot to get it or just use an updated ROM.
As eahinrichsen had said, as long as you're running the stock ROM - you'll get the OTA update. The only problem is, if you have a custom kernel or recovery, the update will (
most likely) fail. In the past, this could soft-brick your device. In my experience, this time (I figured I'd try it for the heck of it), my Nexus 10 simply rebooted after it reported an error with the update and started up into 4.2.2 again. Like I said, I still need to flash stock files as Franco's Kernel modifies some system files.