Here are some cool concept art images from 343's newest game, Halo: Spartan Assault. It kinda looks like it would be awesome if this were all in Halo Wars.
A standoff against the Covenant from a base with a major height advantage.
A bridge scene that could be an excavation site. Covenant seem to have taken over this area.
An awesome shot of a Scorpion rolling through a desert area similar to the one in Halo 4's Campaign minus the dark lava in some of the rocks.
A very cool image of where this game could be taking place, I know nothing about it.
A pretty great image of an arctic tundra where one UNSC unit is passing through. Use the Marines as scale. Yeah.
Here's the cool bridge scene we saw earlier before it was overrun by the Covenant.
These rocks are falling into something but I have no idea what. It look pretty cool though.
All in all, if I had a Windows 8 Phone already or a Microsoft Surface I'd probably get this game. I think it would've been better as a second Halo console RTS but there's no denying how cool these concept art images look. Talk it out.