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"Stealth is available to everyone, but it isn’t as deep as Skyrim. Press control to crouch and you enter sneak mode, which allows you to bypass camps of enemies and complete quests without violence if you’re good at it. It’s based on line of sight rather than dynamic light levels, so sneaking about requires a bit of planning."
in short: all players can stealth. when you crouch, while out of line of sight, you become invisible to enemy players, until they're close enough to detect you.
Imho, this is genius. and will be great for small scale PvP. It's not only Zerg or Die. With Stealth a whole group can effectively sneak behind enemy borders, and the map is huge. Stealth is not only for the "thief" class. every class can utilize it and it even requires finesse to use it effectively.