As the title states here are some DROID Bionic test unit photos. I am not sure if this has already been posted. If it has excuse me. I scoured and came up without any dice. The pictures were found on what looks like a Chinese Forum by the name of PhoneHK.
From what I can gather from these photo's and info on the web the spec sheet reads as such:
System: Android 2.3.4 Gingerbread
MotoBlur (lets just hope it has an unlocked bootloader) styled 3D home screen carousel
If you do a little algebra you can clearly find that it is a 4.3 inch screen when you compare it to the defy in the first pic. So short answer - if you believe that is the final revision it will be 4.3.