MagixX has posted a half-dozen new screenshots from Activision's upcoming Heavy Gear II and five more screenshots from the Starsiege beta are on Datumplane::Starsiege. Here's the lowdown on which giant robots are in which games, courtesy of Derek Carroll at MechCommander.com:

'Mech is short for BattleMech (that's what the apostrophe is for) and is always capitalized. BattleMech and 'Mech are registered trademarks of FASA Corporation.

Herc isn't short for anything that I'm aware of, it's just supposed to look and sound like 'Mech.

Mecha is a generic term for any mechanized-robot-tank-thingy, usually large, always armed to the teeth.