I really don't know much about programming, but I do wish to suggest the engine of "Elder Scrolls 3: Morrowind" as a possible platform on which to build OC2. I say this because everyone knows that large maps are ESSENTIAL for a game like outcast.
Anybody who has played the original half life is sure to know that the game is primarily played in closed spaces, with only limited time in open air, and that too usually bounded by cliff faces. We cannot expect the HL2 engine to be dramatically different in nature when compared to original HLs' since the gameplay will definitely remain similar.
Same is the case with engines of games like Unreal, or Unreal Tourney. The engines of these games were specifically designed for play in closed spaces. If they were subjected to large maps, we can expect a significant slowdown on even the most powerful of machines.
Morrowind, on the other hand is a game which concentrates on the aspect of exploration. Along with that, the game is downright beautiful, if a bit dark at times. I also happen to know that it supports modding extensively, though I haven't tried anything myself. The map of the original game is, in itself, frighteningly gargantuan.
The game in essence is also similar to outcast. Both are third-person action RPGs to the core, with stress given to story-telling, instead of outright action.
Even if Morrowind engine were not to work, I would like to suggest that we look for an engine that will allow an accurate recreation of Adelpha, instead of looking just at the new arrivals.
