So like alot of locks I tend to mess around with Demo on ocassion. It is a fun spec, probably my favorite spec, but it is lacking something. The new change is nice but as far as pvp, meh not much of a buff. I was thinking something simple, very simple. How about adding a few abilities to the felguard, hamstring and/or mortal strike.. I think this would give the tree a serious bump in pvp without buffing it in pve. Think about it, whenever you ran into these mobs while leveling they had either one of these or both. And as far as the playstyle of a demo lock, I think this would fit right in.

Just wanted to throw that out there, I think this is a very doable idea for Blizz to consider.