I would guess that a Jedi Outcast will handle at least 16 players on a decent dedicated server (e.g. two eight-person teams). Possibly more.
So, yes Jedi Outcast will likely handle larger games than the original Jedi Knight (8 players limit on LAN, 4 players limit on internet supported in the original Jedi Knight).
Elite Force (also using Quake3 tech) can handle 16 players (actually I see a few Elite Force servers out there with 24 players, not sure if that is officially supported or not).
Never give in--never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honour and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy.
Winston Churchill, 1941.