I compared the GH-2 dimensions with a couple Olympus 4/3 dSLRs and the results were very interesting. The GH-2 has the :43: mount, not the standard 4/3 mount. This makes it more versatile for using off-brand lenses and adaptors, albeit with manual focus and aperature. But the size is more in line with the standard 4/3 dSLR cameras. GH-2 dimensions: 124mm x 90mm x 76 mm E620 dimensions: 130mm x 94 mm x 60mm E450 dimensions: 130mm x 91mm x 53mm My guess is that you'll soon be seeing the future Olympus Pro PEN camera to be something akin to the GH-2...and less like the E-P1 or E-P2 in form. My $0.02 FWIW...what do you think? P.S. Wouldn't you like to see faster :43: zoom lenses?