I have spent a bit of time on the PTRs, and I stress a little due to a bug that is crash looping my client, and while I have a lot of stuff to bring up, I do want to stress that this is all stuff from the PTRs and virtually anything from the PTRs can change from one day to the next at the drop of a moonkin /dance. That said, let's start with the big things on the PTR right now: Dual Spec and Gear Manager.
Dual Spec
The dual spec system will allow players, at least mildly wealthy ones, to maintain two different specs. The costs as of this writing is 1,000 gold, and requires at least level 40. It also currently does not require any reagent, nor does it have a cooldown. I personally suspect the price might drop a bit, but I am pretty sure the level, reagent, and cooldown will change once the feature is done testing for major bugs. The pre PTR Q&A that was done had stated that there would be a 'confirm talents' type feature similar to those available in mods like Talent Planner, but this also has not shown up on the PTR as yet. I think this is an awesome feature, with great potential and a lot of room to improve the game if it is done right.
Gear Manager
Much like the mods Outfitter, Item Rack, and others, the gear manager allows you to create sets of gear or armor which can be changed easily. You put the gear on, make the set, and then every time you choose to you can simply equip the items just like you set it up the first time. I wasn't able to test this very thoroughly, but I am pretty sure you will be able to changte and edit a set, movign gear in and out as you get replacements, and I will be sure to report more when the PTR realm I am on, Broxigar, is usable. So far, though, I am very impressed with the 3.1 PTR, and I look foward to further testing as the testing continues.

