Hah! My sources have gotten me some new mechs!
First off, the Artimus. A model equipped with cloaking and stealth generators. It's armaments are a pair of magnetic catipults that fire grenade rounds and a small machine gun for taking care of smaller targets. It's magnetic catipults remove the heat signature common on conventional projectile weapons reducing it's over all heat signature. The generator is generously insulated making it almost invisible to thermal imaging.

Next is the manthera. A space class mech six times the size of a normal mech. It's been solely designed for space and sports numerous missle launchers, six particle cannons, a pair of claw-like arms, and a main cannon capable of destroying a small battleship in one shot. It uses an increadibly large A.I. to control all of it's workings. It's truely a monster.
Manthera(It's so big that I had to link it.
xd )