As far as verified projects, only the J-20 and J-16 are confirmed projects. The STOVL project is speculation and rumor on the Chinese BBSes as far as I can tell. It would make a lot of sense for this sort of carrier borne aircraft because it would allow China to rapidly induct smaller aircraft carriers on smaller, simpler vessels once expansion to the 2nd island chain began. Sounding good doesn't make it reality though and I highly doubt it's on the table given the difficulty and remote timeframe when this sort of aircraft would eventually be useful. There's also been some speculation of stealth versions of the JF-17 and JH-7. No authentic news on this front either what follows is my own speculation...the JF-17 and indeed ALL of China's mainline aircraft are undergoing studies or actual flight testing of low-observable modifications, but no purpose built stealth versions of these aircraft. This has already happened to the J-11B when compared to the SU-27 and the J-10B can almost be described as a LO aircraft at this point.
Whether these modifications will eventually result in something comparable in stealth to an F-15SE, I think the Russian derived fighters (J-11B, J-15) have a great potential for this. The underbelly between the engines is perfectly placed for an internal weapons bay that would behave like the PAK FA. The rest would be easy by comparison, not to say that adding an internal weapons bay is easy.