WARS started out as a collectible card game by another game company, Decipher Inc. (Decipher also publishes the "Lord of the Rings" and "Star Trek" collectible card games.) Decipher licensed the WARS backstory to Mongoose for the RPG. Both the card game and the RPG are in a holding pattern at the moment (i.e., no future products are scheduled).
I don't play miniatures, so I can't help you there. I know there aren't any official figures or rules for playing WARS with miniatures.
The WARS universe is awesome. Unfortunately, it doesn't have the instant recognition that some other settings have (e.g., Babylon 5 or Starship Troopers).