Naah, not yet.
I have a few ideas of how it might work. First of all, java means I can make it an applet, so you can play it online in a browser, no downloads required.
I'd use php for keeping track of who is online. When you come online and someone else is too, I create a P2P network, creating a multiplayer game. This way, there's no server needed, just a small webserver to keep track of who's online. I imagine it'd be really easy to cheat, so probably no player vs player fights.
Anyway, let's first finish a decent single player version. I've already done some small work on the GUI and it's starting to work.
I've still got very few time, so most coding is done in class...