The bow looks to be bigger than the 056/A FFLs and even that 2000-ton LO integrated test and evaluation platform. The forward superstructure looks to be quite close to the bow as well (if those dark brown structures are indeed part of the ship).
Three possibilities:
1. A new type of larger FFL (meant to complement/succeed the 056/A FFL family);
2. A new integrated test and evaluation platform; or
3. Second batch(?) of 054B FFG (though I rate this to be the least likely among all three possibilities).
Besides, it appears that one or more of the 056A FFLs are upgrading their radars, and a few of what looks to be smaller-sized USVs under construction as well. Interesting find, nonetheless.