You're damn right British Lion, stealth is not new at all.
And for you Mieux, about the Risk versus reward thing..
I play an EM / Ninjutsu stalker, lv 29 atm.
I can assure you that the risk is GREAT compared to the reward. I do have Stealth + Hide , and i don't feel safe all

hell, there are tons of people that can see me and negates the surprise effect and of course any attempt of AS'ing.
Look, Anyone with tactics + IR goggles (ALL ATs can have that, most good PvP builds has a +perception in it), CAN see stalkers normally, double stealth or not.. WE stalkers could ask where the hell is our advantage if EVERYONE can counter our speciality so easily ?
The more time passes, the more people get used to the game. normal. The fact is that already now, its very difficult to find people without enough perception to see a stalker, this is SO easy to overcome even double stealth..
So the reward is low, because you don't get nearly half the kills a damage AT could have in a pvp zone. And i know what i am talking about trust me, i got 3 blasters lv50, and everytime i go in a pvp zone with my PVP blasters, i get like 5 or 6 times more kills than with my Stalker.
The only consistent Reward for stalkers imo is Fun, and happiness to play a special playstyle. In PvE for example i often do the less possible killing to finish a mission, ninja style

In PVP i'll try to disable the guy that is annoying to my team, or hell, only roaming around the enemy group i act like a big taunt

) my teamates are somewhat free to pwn everyone as they're all trying to get teh silly stalker that showed himself
Ya know, that kind of stuff