The arms embargo imposed on Iran has put paid to any such sale of J-10s. Even prior to the arms embargo China wouldn't supply their version of the S-300 (HQ-9) in order not to jeopardise military deals with Russia. At the time of the Iranian J-10 rumours the Chinese were still reliant on Russia for engine technology until they developed their WS-10 engine.
Even the rumours of Iranian Flanker (Su-27/30) sales failed to materialise. Russia never seemed interested in supplying large numbers of Flankers to Iran. The result is that Iran was forced to concentrate on keeping their ageing US and Russian fleet flying and attempt to produce copies of the F-5.
The Iranians seem resigned to the fact that they will have to produce their own aircraft to meet their future needs. They have already designed and built a small jet trainer and they plan to develop a fighter based on a cancelled Russian-Iranian project. The project came from the Russian Mukhamedov design bureau and appears to be the only way that Iran can produce a fighter in the future.
Iran exhibited models and produced a mock-up. The type is know as the Safagh.
TJ