Hmmm, I'm not entirely sure they would have any drastic impact on PvP to be honest.

If Shadow Embrace is changed to a personal buff instead of a magical debuff, then really I'd call it more of a nerf to affliction in PvP as they use that debuff not for the damage but to clutter up their target with junk that has to be constantly removed. While the warlock would be losing that additional debuff, they would instead deal increased DoT damage or force Purge spam. It's a trade off, and a rather fair one.

The change to the Soul Swap Glyph is practically meaningless for PvP. It would allow for the warlock to choose another defensive styled glyph, but nothing grossly OP on it's own, and I really just cannot buy that having a slightly strong health stone is going to make affliction ridiculously powerful.

As for additional utility, well, I never actually suggested anything. Affliction doesn't particularly need any other disables per say; the slow on Fear, instant Howl of Terror, and CoEx is rather enough, but they could stand to have some raid style buff or debuff that is commonly brought by other specs. I'd imagine the better choice would probably be 3% damage since it has more selective spec representation at the moment -- BM, arcane, Ret IIRC.