The change of Focused Acc is unexpected, and now it's a good alternative for Conserve Power on my tanks. They usually have the end problems already solved by then, and the -perception allows them to not be so yellow candy dependent.
The epic renaiming is also unexpected. And if it's because of consistency, then Frigid Wind reads a lot like Frost Breath and yet there it is.
Not sure about the range reduction for holds across al sets, will make range toons dabble closer to the action and that's not really why they are ranged.
Sould Drain > Spirit Drain is also an unexpected change. Always thought that Soul Drain it being perma-able was balanced by requiring 2 other powers and risking staying longer in melee and drawing attention (during the opening of a fight, where there are the most enemies around), and tied to Defenders/Corruptors.
And now it's no longer only an opening move, which is good; but it has low staying power, so even if you get buffs from defeated foes when cleaning up a group any benefit will be gone once you reach the next mob.
Thematically fits in Dark Mastery, but I agree with those who say the change seems to break some of the sinergies current Soul Drain has with def/corr blasting sets.