...and few suggestions on PvP system at all. Let us begin.
1) Sith Defiance talent, tier 1 Madness. 2 points for 2% damage reduction? This is ridiculous. I suggest either increasing the damage reduction (like, 2% for 1 point 5% for 2 points, or 3% for 1 5% for 2, varies) or adding something (like, 2% damage reduction AND 2% increased healing received, or 2% damage reduction and 2% damage increase, also varies).
2) Implement some Fear mechanics! I've enjoyed Sith Dreadmasters' appearance on the final stages of my storyline, and I think that Fear mechanics perfectly fit a Sorcerer. Let's say, Madness specced sorc will have Whirlwind transformed into Force Terror, or Force Fear, or Force Horror (something like that) and will Fear the target instead of cycloning it. Fear mechanics could be the same to ones WoW has (doesn't instantly break on damage, runs mindlessly across the terrain), also varies.
Lightning and Corruption specced sorcs can have their own control rebalances, but I haven't yet thought of it tbh since I'm Madness specced.
3) Plus I'd suggest reworking the whole control and Resolve systems, because people REALLY rarely control anybody except their primary target, and all you can do is throw a single stun (stealth classes can do 2). It is practically impossible to down a GOOD healer having only a stun and an interrupt that closes only ONE spell.
4) One minute CD on a simple control spell coupled with awkward resolve system ruins the whole control system and makes it completely unviable compared to just trying to burn down somebody. I haven't thought really much about how it can be changed, but I'd suggest either dramatically lower the cooldown on control spell, or simply refresh the CD when it's broken/duration's finished. Resolve will keep the target from being constantly controlled, and you will have a potent control spell whenever you have needs. Of course, it will have to be casted (e.g. Haunted Dreams talent - Madness tier 4 - will have to be reworked. Can be combined with Fear mechanics suggestion I've written above).
5) Dispel-protection mechanics are a must at least for Madness specced sorc, because a healer OR another sorc/sage can dispel 2 dots with 1 gcd, and we have only 3 dots, 2 of which have cd. It can be either implemented into Death Field's Deathmark (can't dispel any of sorc's debuffs until Deathmark fades/you take extra damage while dispelling something under Deathmark, varies) or be made into completely different spell (e.g. Unstable Affliction/Sin and Punishment (Vampiric Touch modifier) talents in WoW).
Those are all suggestions I have yet. I understand, it's raw and awkward in many ways, but imho if shaped and rebalanced/thought through and made into something different from WoW equalents, they can be really useful. Post your thought and suggestions, sticky this if possible.
English is not my native language, feel free to correct any mistakes in this post.
Thanks for any feedback!