Funny you should ask Walt. I saw the thing at the Shot show and was given the assignment to check it out for a story that will be in the next issue ofAmerican Handgunner.
The cartridge looks very much like a .45 except bigger. It has a rebated rim to the same size. The case is 0.060" larger in diameter which means different magazines and frame mods.
There are two loads for now, both with Speer 300 gr. TMJ bullets at 700 and 900 fps. The recoil isn't bad at all. The lighter load feels pretty much like .45 ball in recoil terms and the heavy one much like early, hot, 10mm.
External appearance is identical to the 1911. I've shot it about 300 times now with no malfunctions at all. It really smacks the gong too.