Its not like actual players who are not AI wont see some guy crouching go behind him like in the main games. Even invisibility wont work because you can still see the persons outline if you have good eyesight and are close to the person. So how will sneaking work?

Crouching and moving slowly. Harder to detect with enemies. PvP i assume it would just be an outline.

Hopefully not complete invisibility like TOR. Which is totally unfair and makes it impossible to 2v1, because 2 stealthers can just jump out and kill you whilst youre out questing.

Sneaking will probably actually be like sneaking in real life

Avoid line of sight

Stay in the shadows

Make very little noise

Guess like in other MMO's, you'll be invisible. I don't see any other idea how to solve this issue.

Would help if the interviews would ask some new question such as this and not the same old same old.

I'd say you'd be invisible to varying degrees depending on noise your making, light, and line of sight if enemy.