Run the update and if it kicks out root then just re-run the root. I got mine last week at a special event and updated it on the 11th, and rooted it last night sucessfully. Currently rooted on build ZV8.IMM76L.
Attempted root again and this time it went flawless. For some reason running it in admin mode caused error, when I ran it with out run as admin it worked and now device isn't sluggish and I can use Titanium backup. Thanks a bunch!