A 4.5" display does not add up to me. I am putting my materials manager & demographics hat on:
1. The 4.3" qHD display is a proven panel and a better cost decision- plus already used on the DX2.
2. Since the device is already pushing a dual core and LTE, putting a 4.5" qHD LCD seems like jumping on an already shaking battery life bridge.
3. The cost will be higher
4. The sales would be less, since the size would be prohibitive to some.
Logic and reason suggests the Bionic has a 4.3" display, but based on Motorola's screw up of the Xoom (sdcard, LTE and price point) and the DX2 (funky bad firmware), I do believe logic and reason have left the building at Motorola.
The Bionic had better go "Nu nu nu nu nuuuuh!" instead of "Droid!" when turned on.