The rotation isn't too bad, might want to throw Curse of Agony in there for trash mobs, try making a macro so you cast amp and then Curse of Agony just utilize it as often as you can, actually with the imp Curse of Agony from the aff tree you might want to replace either immolate or UA just to save a bit of time and maybe get in an extra SB. Since CoE has been much improved since the patch you might just use that instead since it will help mages, locks, and shadow priests, kind of a call as you see it type think, but CoE is probably your best choice for bosses. I'd probably say respec a bit the imp CoW is pretty much useless i'd say just put it into fel con just cause if you pull agro you can try to keep your drain up to help stay alive or suppression just for that extra percent. Also just put 1 point into SE and the other in Nightfall so its max... any time you can pop a insta cast SB is a good thing. Whether or not you really need points imp howl is your call depending on how raids have been going. I'd say take the pts out of demo and put them into destro to get some crit, range, and shadowburn. Though the demo is good if you seem to pull aggro often but usually you want to do as much dps as able, and as a lock you should be towards the top of the ladder on dps.
http://www.worldofwarcraft.com/info/...10200000000000
I'll say that you talent build is more of a well rounded build so you have some survivability... only real things i'd say is don't waste point on imp CoW and max your Nightfall, you really just need 1 pt in Shadow Embrace to make it useful... on the build i did i decided to put the extra 2 pts into imp HS but you could use it for Imp howl, some extra stam from DE or even in Imp imp if you tend to run with your imp while raiding.