From their announcement:
We’ve posted the basic rules in PDF form for the MERCS skirmish game to our forums. It’s just the basic rules, so it’s only about a quarter of the pages that will be in the upcoming full printed book. However, it’s definitely enough to learn how to play the game and its loaded with pictures and diagrams.
Also we have the movement/stat cards available for purchase on the store that the player will need. Also the figures for the FCC and USCR are now all in and available for direct sale. As well, e-figures has picked us up so retail stores that use e-figures distribution can now pick up our product.