Warframe may not accurately convey the combat and characters in which it contains. The mental image I get of the free to play game from Digital Extremes is of some big hulking robot, but as the latest alpha trailer shows a warframe is anything but. Can you say robotic ninjas? There's no slow lumbering combat here, just fast paced third person action with plenty of explosions, swords, and co-op.
There's a beta planned for the game this Fall, and Digital Extremes has said they'll be announcing a more exact date soon. Warframe will feature four player online co-op when launched on the PC.