Interesting...
This might be stretching it, but in a recent interview Carl Zipfel, the exterior design director for HUMMER, was talking about how important approach angle is to HUMMER, then mentions how the HX has a 56 degree approach angle, and the H2 has a 55 degree approach angle. Now, we all know the current H2 does not have a 55 degree approach angle, so maybe he slipped the approach angle specs on the new H2? The concept pictured above definitely looks like it could have a 55 degree approach angle... Or maybe he just made an error (which would be weird, for someone heading the exterior design of HUMMER's)
Here's the interview
http://youtube.com/watch?v=Dbm6QF7T3oE