With the changes to Vindication, I see that each individual hit will be worth more overall threat that it currently is. That being said, I am looking at this build for a MT setup. http://www.wowhead.com/?talent#sVZA0xA0ugGsIufdxb
I keep the bonus point in imp judgement for several reasons. The 6969 rotation is totally maintained and you gain an extra GCD roughly every 3rd rotation for SS renewal or whatever is needed without loosing time.
-5/5 improved seals is going to likely to see higher gains in 3.2 but I have not been able to get on the PTR due to some totally corrupted files.
-5/5 Reckoning. I think this is going to be one of the better changes with the new Seal system. Reckoning will be good for any build that can pick it up now. If you are worried about parries, then you don't have enough expertise. I usually run 21-41 expertise depending on gear sets and weapon choice. (dwarf racial ftw and tanking maces!)
Ideas on 3.2 builds welcome!