MSN004 recently underwent join-up of its three main fuselage sections at ‘Station 50’ in the FAL. This stage follows the successive delivery of the three fuselage sections between beginning and mid-August. Next steps include the assembly of the wings as well as of the horizontal and vertical tail plane.
Interesting news. Here's my take on what it may look like, alternately, it may be similar to what Airbus did with the A380 on its world tour where it had the airline's logo (see here for an example). A359 Qatar Airbus Hybrid copy by JKKW, on Flickr
Could it also mean that MSN4 will find its way to Qatar after Airbus is done with it?