It's exactly artwork... It's gameplay, the bigger picture - as some of those effects seen in the screenshots are applied real-time in the game - e.g. the glow around the spelunker.
I'd like too see what Olmec looks like in the Xbox version...
That one he's pretty much obligated to keep away from us till it's released and seen firsthand.
But I also wanna see him, the other bosses, and TM.