All the proposed stealth related abilities are up for review in the Chamber of Elders, they'll be explained somewhere else on main later once they are confirmed. The short version is lower levels will be able to hide, avatars will be able to stealth around and other avatars will be able to stop them.

All listed in full detail in the Elders forum if you have access to it, once I have all the kinks and possible abuses of the system fixed I'll post them in the main forum. I'll be testing them all out on Dev soon and deciding on how much focus they should cost to use.