Without being able to compare the graphics and features of the two versions, it is impossible to tell if the Xbox version should be delayed in order to get it right. Maybe Larian is already planning on doing the Xbox version right, and the PC version is being delayed until that is done (any extra time could be used for a final bug and balancing pass). Maybe much of the development is the same on both platforms, and it is just a case of optimizing the details for each, so they would be completed about the same time anyway.
The interface and controls for the Xbox version were done first, so we at least know they are not developing primarily for the PC and then porting to the Xbox afterwards.
