The rules are skirmish rules. They are designed to be easy enough to play with lots of figures, but still fun and challenging with less.
Your average game at the moment will be 20 models, 6 Orcs to 14 halflings. However, I have played games with double that with ease. You just have to use tokens more often (which are, again, supplied in the box and available seperately).
Dave, who penned the rules, is confident that you could play the game with 100 models comfortably. There will be lots of extras coming out including different races (with national/regional parallels)...
When I get all my painted models back, it is my intention to do a 'playing the game' video, describing how the game works!!!