Yes it's not finished but then don't show it off with colors and textures it might not have in the end, or just clarify that it's placeholder. Again, this might be a shit storm caused by lack of clear communication rather than what they actually intend to do. It wouldn't be the first time...i'm pretty sure its just not finished yet...?
Its not going to make much sense stepping from the BMM into the defender in its hangar and having the whole esthetic change.
I could be wrong but i just dont see it happen considering the effort which has gone in to the rest of the game.