Just from questions I asked that were answered: Headshots do no special damage or insta-kill Earthmovers and Cranes are on the to-do list, and some will appear within the first three updates Also, Sparkscape is a BEAST in combat, but costs 1950 in-game Relics to buy. In comparison, Front-Line, Catapult and Meltdown are all 550 apiece.
1950 is pretty much the price for the big hitters/newly revealed for each team. the ones revealed long ago (like Drive-by) usually cost 550.