Ok, now that the discussion is pretty much just about 5.3 (and that's clear)...
You'll GAIN the following:
1)- Your moves cost 40% less damage during blades. Since blades is a wee bit longer and off the global, we can assume this is the whole kill cycle.
2)- Your global cooldown on the moves that matter will be reduced down to 0.7 seconds, down from 1 second.
3)- Rupture and Recuperate will gain duration as if they had an extra CP used as well. (fixed)
4)- The gemming is a little bit nicer IIRC.
You'll LOSE the following:
1)- Your big pool of energy. Currently you gain +30 energy for the pvp bonus, this will drop. A sub rogue will have 100 energy max instead of 130.
2)- Deadly Brew. You won't have cripple for free while you run paralytic. I would assume any gibby setup such as this would be running the +10 damage taken whilst stunned anyway.
3)- Two +PvP Power set bonuses. Both the 2pc and the 4pc should be this, unless that got changed.
4)- All the inherent PvP Power on the items.
5)- You'll probably miss out on the improved recuperate glove bonus. If you choose to keep that, you'll have to run the hat/chest/legs (the big pieces) as well as the shoulders, so you'll be missing a few more stats.
I think we'll see around +30% PvP power in full PvP gear post patch. Can anyone run some math to see what that will shrink to if you discount out the set bonuses and the raw stats on the items? I can't wowhead right now, but you can just sum up the PvP Power on the ptr.wowhead.com values for the 496 chest / legs / shoulders / gloves, plus the 2 and 4 piece bonus power, and then we can divide that number by 400, and that will at least give us the base percent missing (relative percent you want to divide the new bonus by the old bonus).
I don't think it's surprising if we get a more powerful blade cycle with the 496 PvE downgraded gear, because the set bonus is very strong. I do think it's surprising if that really makes up for the PvP stuff. Hrm.