so what does it mean? is China going to that route (catapult)?
Yes, we all know that the Navy will be having CATOBAR carriers sooner or later. And rumours of a catapult compatible J-15 have been flying around for a few years now, so this J-15 variant is not unexpected.
What will be important to see, is whether this J-15 in the picture is a prototype for a newly overhauled J-15, such as a J-15 variant improved avionics (AESA radar, etc) and so on, or if it is merely a one off standard J-15 meant for catapult testing.