Firstly this is a *preview* meaning that it is set in as much stone as in a bar of chocolate (ie none).
These arent all the talents/changes and hell, even if they all make it through to the PTR they will probably get changed a bunch.
Right, firstly - pestilence was always intended to be a disease spreader and that was all. The damage bonus is something that has evolved and now people are thinking "omg you completely screwed it now". Going back to early dk development it was pestilence for spreading diseases and then BB to get the threat. So they are going back to no damage on pest, making BB do a baseline damage (prob equal to current damage it does) but pumping it up a shitload if diseases are there. Makes for some interesting AoE tanking rather than just tabbing pest a lot.
The change to Sudden Doom is probably the best thing I have heard tho. No more wasting GCD - just POW, and bonus DC. Good stuff (specially as a blood dps'er).
Swapping of UB and Garg - perfect sense really. They have finally come to the conclusion that balancing gargoyle for the tier it is at quite frankly isnt possible. Its either going to be unbelievely good & overbudgeted for its spot, or nerfed to being trivial and not worth the point. By putting it at 51 point they can at least justify it being slightly OP (a la TG for warriors) by saying it is balanced through the investment of point in Unholy tree means not accessing other good abilities in other trees.
Plus UB being lower will offer quite a little bit of consideration theorycraft for possible tanking builds to incorperate it.
All in all, quite interested to know what other changes are to come (please note, no nerf to damage on shit.. well not yet).
Not sure about the loss of expertise on Blood Gorged really - but with blood being primarily physical damage based, I can kinda see why ArP was viewed by them as being good.... dont like the stat personally (ie I hate it on gear that could itemise better with other stats for us) - but as an added bonus to a talent its well worth taking still.