In this video I'm going over my thoughts for affliction warlock talents for tiers four, five, and six.
I have started trying out sacrificial pact and am liking that a lot, so I may redo this video next patch.
If you want to improve your arena and pvp skills for MoP, check out NextLevelPvP (http://www.nextlevelpvp.com?ref=Toastmonster-17) where you will find guides on how to gear your character, how to effectively use your spells and comp vs comp guides, not to mention the forums where several of our contributors actively post (and it's free!).
Music: Thanks to LDUKMusic for the intro music: http://www.youtube.com/user/LDUKMusic