The gents at Halflilfe2.net interviewed Elysium 2028's lead programmer recently, and considerable beans were spilled. Here's but a taste of what you're getting into:
Halflife2.net: Will Elysium 2028 be a fast paced shooter style game, or a stealth game based on tactics?
Brendan: We've tried to strike a balance between both. The single player game will often call for either firepower or stealth, and many times we'll offer multiple ways to achieve a goal, leaving the choice of methods to the player. I have to say that while there will be plenty of chances to try to be Rambo, our damage model is a bit unforgiving, and attacking a score of heavily armed men without giving your actions some thought may result in grisly death. You've been warned. Multiplayer is going to be similar. Instead of having one generic gameplay mode where the primary objective is killing the enemy, we're going to have an array of scenarios involving two and sometimes three teams where every team is put into a role and given one or more conflicting objectives. Matches may involve Counter-Strike style combat, or Splinter Cell-esque infiltration, or even some scenarios that are race-like. Importantly, multiplayer will combine conflict outside and inside the Elysium network, but right now we aren't going to give away a lot of precise details on the latter, because we don't want to have people's hearts set on something if we decide to change it around a little during play testing. You'll have to come and talk to us about that when the mod has advanced more.