I made my Rogues build based of advice given by Assassinette on the Blizzard Rogue Forums. I'm at level 77 and every mob is dropping like flies with me still at full health at the end of the fight.
I would recommend making a few changes to your build, primarily to take Dual Wield and Precision from the combat tree - the extra Hit Rating and off hand damage is useful to say the least.
I would drop Focused Attacks as 2 energy is pretty insignificant - mutilate costs 60 and on a crit you get 2 back? Worthless.
I would drop Master of Deception - which is really a PvP talent - and Initiative which is not a great talent for raiding.
Drop another point from somewhere else and you have enough for the combat tree items.
Take a look at my armory profile to see my build at lvl 77:
http://eu.wowarmory.com/character-talents.xml?r=Azjol-Nerub&n=Rennick
EDIT: I've just re-read your post and seen you're doing Arena, so my post isn't so relevant - better for Raiders. Feel free to ignore my nonsense.