Thats a pretty cookie cutter spec for arena (24/37/0 or 23/38/0), but take the points out of imp sucubus and put them in demonic resilience. I'd also drop imp CoA, make sure you pickup CoX, put 1 point in suppression, take 1 off emp corruption, move 1 point to mana feed.
You'd use a felhunter for soul link, spell lock and devour magic. He'll run out of mana in long fights, when a simple life tap would regen him otherwise.
So I'd go 23/38/0 just get those talents (1/5 suppression, 1/3 mana feed, 3/3 demonic resilience), you dont need points in sucubus.
Mine would look like this - http://www.worldofwarcraft.com/info/classes/warlock/talents.html?1500220512201110000002050030133250101531300000000000000000000000