So three questions.
What are the basics?
How does it work in PVP?
How does it work in PVE?
Speculation is welcome as well.
Stealth classes are capable of rendering themselves invisible to the enemy; this offers an advantage in intelligence gatherering in RvR, and allows them to choose when to attack. DAoC's rogues are divided into archer and assassin subclasses. Assassins specialize in hidden attacks and quick kills. Their unique style line, Critical Strike, allows them to attack unsuspecting enemies from stealth, inflicting massive damage. This style line focuses on reactional style combos as well. Assassins also make use of poisons to inflict various status effects and weaken their opponents. Archers are the bow wielders of the game, striking enemies from a distance. The archery line gives these classes access to a variety of different shots, allowing them to pick and choose their damage type between elemental and physical depending on the situation. Although the Minstrel hybrid class can train Stealth, the primary stealth classes are the Hunter, Infiltrator, Nightshade, Ranger, Scout, and Shadowblade.
in ESO you'll be able to render yourself invisible as well. It'd be really awkward watching an enemy crouching in the distance and you walk up to him and say "Psst what are you doing?"
Watch http://www.youtube.com/watch?v=1IUptB0hymo, it is of a Shadowblade (Midgard Realm) fighting in RvR (pvp)
Here's how stealth works in ESO:
Not in Cyrodiil:
Invisible, but line of sight matters. If you stand in front of an NPC, they will see you.
In Cyrodiil:
Invisible, but you will have a shadow on the ground for anyone to see. If you stay in shady areas, you will not be seen.
All of this also depends on a spot check, based on your skill and their ability to see you.
While in stealth and moving you will lose stamina. If you stand still, even in stealth, you will regain stamina.
There are skills/spells to detect stealthed and invisible subjects.
Well we already know several ways to counter stealthers in this game. One of the skills in the Mages Guild is called Magelight and it helps you spot stealthers easier. Also any damage they take will also break their stealth too. So if you use any sort of AoE ability and it hits them will break it.
Stealthers will be more effective as scouts not so much in the middle of a fight. You would use them to scout ahead and tell you where the enemy is around a keep before you rush in.
lol aweful video btw...but I really hope stealthers will be a viable asset to the realms. Im praying the skills that detect stealth wont be too powerful as in DAOC everyone and their bot had em and all but ruined the game for me. I don't mind there being skills to detect stealth as long as they're duration is very short and range limited. You use it, you see a stealther, you pop him. But being able to cruise around looking for em would be imbalanced imo.
In DACO I was pretty much intel for pvp groups alerting them to enemy groups/size/makeup. I would camp gates or routes for reinforcements so we didn't get ambushed taking a keep. I would also jump stragglers who fell behind groups and when we had a team of stealthers, we would even jump entire groups. It can be tedious but I absolutely loved my SB.