I don't think I've ever heard of it. Wow... how'd I miss all those? Was it only console before?
And what are the mechs? Are they robots or are there people piloting like in other mech games? Trailer is cool.
Like Izerous mentioned, Sony only.
It played kind of halfway between a Mechwarrior and gundam game. It leaned more towards the 'Sim' side with various frames, builds, heat/weight management, but more jump-jet use and faster gameplay than Mechwarrior. While it was faster it still felt very much like heavy mech combat compared to your average Gundam or Another Century game which leaned more towards fast action games. In the later entries you'd also fight mega-bosses that were giant mobile platforms.
I honestly prefer AC over Mechwarrior by quite a large margin. Like Mechwarrior you could really dive into min/max-ing builds, but AC you could also 'pick up and play' a lot more over MW. With a PC release I really hope there's decent mod support. Would be cool to see some custom mechs hosted on Nexus, and even a few ridiculous Macross/Gundam/Pacific Rim mechs for laughs once in a while.