From an article on bluesnews.com about the demo says:

MAPS:
- Game Mode: Select the game mode you wish to host: CONQUEST in this demo. The full game will also provide CAPTURE THE FLAG, TEAM DEATH MATCH and CO-OP.
- Map List: Select the maps you want to have in your server rotation. Each map has been designed with a specific number of players in mind. Keep that in mind when setting the maximum number of players for your server. Feel free to experiment with more or fewer.

So I assume since the demo only had one map, the above pertains to the full version as well. Try it out and I'll see ya'll before you see me... *bang*