There's a bunch of these now. Contractors the latest, Virtual Army looks good on the horizon, and there's Zero calibre out there.
What is the deal with 5v5 limits? ill argue the point, non of these will be hugely successful until there's 10 or 16 a side. There's definite willing, the latest release always see's a initial huge spike, people want one of these games to succeed. Pavlov seems to get a free pass because of it being the first, the workshop, and the viral noise surrounding it. Even Pavlov loses it's appeal though, more players would make people more than just fodder for the one player that dominates and ends most rounds in 60 seconds.
Ranting... but frustrating as id like to jump in on these games, but don't knowing there only going to fade in to obscurity after a month or two.