I remember Dave saying that large numbers of players in an area will be managed by some disappearing when client load gets too excessive. In 100+ battles thats acceptable.
But... in the new Gamespot video there's a fight going on over an AMS. The player leaves the stealth bubble to chase some enemy; the guys he's chasing phase out of view (fade invisible). Even after leaving the bubble they phase in and out of view; and thats enemy maxes and soldiers not stealthers... so whats going on? The targets in question are only about 30ft away. Hopefully its a bug from jumping in and out of the AMS bubble, and not the client phase out thing Dave mentioned.
If it is... then... OMG.
Having others phase into view and out when they're within spitting distance... <goes pale>