Thanks Joe, this is what I was looking for:
The EOS 5D Mark III camera features a built-in HDR mode, merging three images at various exposure levels into a single image, in-camera, for stunning photographs of landscapes and architecture with enhanced tonal gradation beyond the range of the naked eye. The exposure levels in the camera’s HDR mode can be set to cover a range of up to ±3 stops, in a choice of five settings: Natural, Art Standard, Art Vivid, Art Bold and Art Embossed providing unique visual effects. Individual source images can be saved as separate files, and the HDR mode has an optional automatic alignment function that can be useful for hand-held shooting. The EOS 5D Mark III’s standard Auto Exposure Bracketing function has been upgraded to allow for up to seven exposures per sequence, and exposure compensation can now be set for up to +/- 5EV.
7 frame option now available in the 5D3....this was one of the main reasons I got the 1Ds2. I really like the 7 frame option.
As for the HDR mode, if I am reading it correctly, it sounds like like you can space the 3 frames 3 stops apart and the camera will combine them AND save them as separate images as well. That could be pretty cool......if it does a good job. It would be really nice to test drive one of these bad boys in a house for a day.