I'm actually not that concerned.
Privateer Press have been trying to make a Warmachine computer game for about as long as they've been making actual Warmachine, so if the time is now I'm confident it's because they think the time is right.
My only concern is about the narrative of the game. Are we going to be forced to play as a specific faction opposing the others (if this is the case, most likely you'll be Cygnar), or will there be the possibility to play as all (or at least most of) the factions? Will there be a Starcraft-style set of Faction Campaigns linked by a single overarching narrative, or will the plot be dependent upon which faction you play?
The nature of Warmachine being what it is, how many Khador players would be as enthusiastic about the game if it's all about you as Stryker shooing away those Red Northerners? Or how will Cryx players feel if the game requires their favourite faction to be sent packing with their tails between their legs?
Unless it dumps on the Retribution. No-one seems to like them...