Camo != stealth. I think it's a pretty safe bet that some sort of camo is going to be in for the archers. True stealth (the useful kind) is another matter. I do have a very cool concept but it's still in the earliest stages.

Source: KS Comments - April 08, 2013

We need to find a way to make stealthers, archers and maybe some other classes viable in an RvR environment if we are going to be really successful. However, I can't commit to them until I'm sure that the mechanic has a good chance of succeeding.

Source: KS Comments - April 07, 2013

What I have said about stealthers is that there won't be a "hit key 1 to vanish, hit 2 to engage strong opener and hit 3 to vanish" gameplay.

Source: KS Comments - April 03, 2013

As to stealth, that is something we are going to discuss with our backers. We do have a mad/insane/BSC idea for them. We'll see what people think. 

Source: KS Comments - April 02, 2013

No final decision on our stealth-type classes has been made, mainly because we have a new mechanic to use for stealth that we want feedback from our backers on. What I can say though is that we will not have a class capable of going into stealth instantly, popping out, having a strong opener/long-range DD and then instantly popping right back in. Also, we want to include a scout class if we meet one of our stretch goals. It would be designed, as the name implies, to be very strong at scouting but not at long-range damage dealing.

Source: Community Q&A