Motorola had to change the Bionic's processor and now they just announced the Photon 4G which seems pretty similar to the Bionic except a Tegra 2 with WiMax instead of LTE. Same qHD display at 4.3", 8 mp camera (starting to seem familiar?) with no hump, vga FF camera.
So I'm guessing Moto really did have trouble with the Bionic and Tegra 2....no wonder it's been delayed.
Motorola's 4.3-inch Photon 4G brings Tegra 2, kickstand magic to Sprint (video hands-on) -- Engadget