Yes it is max/msp.
A patch made by tehn/Brian Crabtree, the maker of the monome.
It will(as all his, and many others patches) be available for download and modification.
Here is most of the apps made for the monome, the last 5 years:http://docs.monome.org/doku.php?id=app
The monome community is the best community I have ever seen, so I can't do anything but to look forward to all the great apps that will be available.
I will definitly get one, but I might have to wait a while.