Yes, Battlefront, I knew that.
If we created some awesome new version of Battlefront with an entirely new setting and story it could be interesting.
I've also always wanted to make a space based game similar to DotA, LoL or HoN. One that allowed players to completely customize their ship with armor, weapons, special abilities, engines etc. That would be another neat idea.
If we make the project 100% open source I think that would end best, however, a server does cost money so a completely free game might have it's drawbacks. Unless we allow for Third Party servers. Even if we do charge I don't think we can use that money to pay those that work, I expect people will dissapear, reappear etc. Additionally how can you compare the amount of code someone contributes? Lines? Characters? Objects? Models Created? Textures Made? I can think of no good way to evenly distribute any income.
Besides, as an Open Source project this would be able to help new people and old to learn some new things.