After vigorous testing in BG's, There are some major flaws with these specs in PVP.
Affliction just does WAY too little damage to be truly Viable.
A full stack of dots should NOT be something that your enemy ignores.
Yet at the moment, a Warrior in combat with someone else does enough Passive healing so that your Dots dont even move his health Bar.
Saying that it is balanced around soul swap is just plain wrong. Not killing 1 person is the same as Not killing 2.
Destruction suffers from the usual problem of very low regular damage, and MASSIVE crit spikes, so that we are a RNG class once again.
Why do they not buff base damage so that Incinerates do more than 7k (less that warrior White damage) and make crits less of a factor.... RNG doesnt impress anyone and it makes fights nothing more than a roll of the dice, which takes zero skill.
The general route of balancing for this (as we saw last expac) was to cut crits in half, then leave it a few months before they fixed the terrible damage we were left with.
Anyway, this is just my observations from hours in WSG trying to 1v1, 1v2, groupvgroup as much as possible to get a decent feel for the specs.
Lock is far less fun to play this time around... Especially when you see other classes with some very cool PVP tools, and all we have to look forward to is our identity as a Lock being essentially destroyed with the Affli situation, and nerfs when they balance crits without improving anything else.
Oh and expect some nerfs to fear too... It actually holds for 1-2 seconds now, which is obviously WAY too long.
EDIT: Forgot to say this is on the Beta servers.