Apparently, what looks like one big ship (with an AOR like bridge/superstructure at the bow) is actually two ships in tandem. The module closer to the camera may be the 12k.
In the third photo you can see the aft module with what seems to be a helipad (currently lacking hangar?) alongside a newly launched 052D (maybe number 5?). The aft half of the mystery aft module is almost as long as the 052D, which I think gives some indication as to just how big it will end up being. Whether it actually is the 12k is another matter...