I read someone say that the one we saw last week could be J-15B.Finally, the J-15B - as it seems most likely officially the J-15T - catapult capable variant has landed!
Interesting: It looks to be a LRIP aircraft numbered 1518 (cn. 010014), that was so far not known and it is powered by WS-10 engines!
(Images via @中国军号 from Weibo)
Unfortunately, the images are too large To post!