Can't find the core management options anywhere either.
When I updated mine I had a couple of problems. 1st it overheated like having a piece of ember in my hands and Google Play wasn't working properly, either freezing or giving me some problems with a "background data" option which I couldn't find at all. After rolling back Google Play services to a previous version I was able to update some stuff slowly one by one and even Google Play services themselves without problems now.
Right of the bat this update seemed to make the tablet a bit sluggier I'd say, mine at least. But now after getting over the stress with Google Play and all it's getting more fluid.