Ugh, this makes me think of the druid feral tree. They get everything good we ever got plus some, without all the cooldowns, in a single tree. :( My feral friend in worse gear than me has more then twice my AP, much better stealth, hits mangle practically harder then I do mutilate, etc... The only problem is, unless he stance dances a lot, he can't stay alive very long... Rogue tends to beat cat.
I'd definitely swap Surprise Attacks for Prep. It's a pretty fair trade by actual dps, and makes combat daggers/fist weapons/anything more viable... (Although, at the same time Swords and Maces get majorly buffed too, so it's not really a difference at all >.<)
Another one would be Combat Potency for, say, Deadened Nerves. No one takes DN anyway, and imagine the energy gen. with mutilate/shiv spam and potency. That would definitely take the edge off combat swords/hemo winning for raid DPS, and make PvP a lot more fun as mutilate too, by making the massive Mutilate damage stay steadier instead of having to wait so long for each mutilate.