So I just stumbled upon this:
Item - Rogue T18 Subtlety 2P Bonus Your Vanish now awards 2 Combo Points when used. 5 Combo Points when used and increases all damage done by 25% for 10 sec.
Item - Rogue T18 Subtlety 4P Bonus Your Eviscerate reduces the cooldown of your Vanish by 5 6 sec per Combo Point used.
So the set bonus that was already considered crazy strong is now even better!
I reckon the chances that these make live are slim, but hoping is no sin!