I have stumbled on news of project Bossanova while going through the list of games using Unigine (http://unigine.com/products/unigine/showcase)
I was checking out MMT on indieDB, and I have found contradicting statements.
The winner of the project, MMT, was originally a windows game. Now apparently is MOSTLY a linux game (the win port has not been dropped)
At the same time OMGUbuntu states: "With Project Bossanova, our aim is to deliver the first ever 3D game to run exclusively on Linux" (http://www.omgubuntu.co.uk/2011/02/announcing-project-bossanova/)
The project bossanova website is unreachable (at least from the southern hemisphere).
PS: MMT is not in the DB as today