Ooh TIFF output sounds like a dream come true!
I wish someone could confirm this. The user manual is not out yet, and this bit from the review is slightly vague (could mean the pre-existing tool where you link the camera with you machine where it's already possible to create TIFF files but by per-file basis).
The X-Pro3 --- gains the ability to output TIFFs if you want a highly editable file with the camera's color already applied.