One is under development already, and if the company is to be believed it'll be out later this summer. The JF-17 will be a perfect rival to a F-16 actually.
Also...i wouldn't ever get my hopes up about a Su-35. It's way way too modern(think super hornet not legacy hornet). Honestly, just about all the rivals to the F-16 are in the game, just not high fidelity and as others have said...we arent getting the data to make them high fidelity anytime soon