IIRC they haven't changed the stealth system at all during EA. They reworked light a bit but that's it. Personnaly not playing much with stealth in games but the system as is is very uninterresting gameplay-wise and only serves cheesing. I really think they will improve it.
A better vision cone, a hearing radius (which is basicaly a second "vision cone") and ennemies a bit more active to search the players would probably solve most issues.
