Thanks for your quick replay Phil ans MikeyD.
Well I started the experience with CMBN so I dont know how the team works. BIS team was a small Czech team at begin (OFP 2001, ArmA 2007, ArmA 2 2009) and still a small team compared to big majors compagnies.
ArmA and Combat Mission are both good games with unlimited time of play.
I really like CMBN, I played it hundreds of hours but I would like to see more updates between two commercial releases. Anyway I'm happy to see those patchs coming and i hope they'll fix some bugs and performance issues too.
Edit: and now I bought the CW mod.