Someone even video’d a multi-player demo at the Maemo summit.. 😉
It’s not publicly available (for the moment at least) from what I can tell, a comment on YouTube says:
Currently not (“yet” I’d guess) – but remember that this is just a work in progress / feasability study – this is only a developer version that got distributed over the weekend during the Maemo Summit 2009 in Amsterdam.
Still, looks fun! 🙂