I think sap is meant to be single mob at a time now, as that's what it says in the official guide, so that may be the coming change. Otherwise Priests' sleep would be highly gimpy because it has the one mob at a time limit.
The Vanish ability sounds very cool...very Ninja, makes me grin just thinking about it -- *Ninja VANISH!!!* -- OG Dragonball, anyone?
Erggggg....can't wait. At least in ~four months I can play open beta
PS: Your Rogue is very funny looking
Just in case the link does die: