Yes, I believe some of the Southeast Asian countries might be interested in the AFC, being a cheaper alternative to the American's F-35 and most probably cheaper than the Russian's T-50.
Malaysia and Indonesia both fly Russian aircrafts now and I don't think they will reject the AFC if the aircraft is good enough and serve their needs, especially Indonesia who had gotten quite a number of military hardware from China in the past. Vietnam and Philippines are out of the question because they do not have that good a relationship with China right now (especially Philippines), Singapore can be ruled out too, because Singapore seemed only interested in getting their planes from US and maybe Europe... and is already looking into getting the F-35.
Another country that might be interested would be Thailand, her current air force fleet is really not that credible and they do have the economic capability to upgrade their air force. The other one (although unlikely) is Mynamar... Mynamar had been China's ally for some time now, she might not be economically well off at the present, but she had oil and potential of growing up pretty well, so in future she might be looking to upgrade her fleet too, and if she didn't fall into the western embrace, then she might be looking to China and Russia to supply her with advance fighters... the AFC might be an attractive alternative if the price is right.
Traditional ally like Pakistan would surely be one of the first to have a look at the AFC... I think chances are high for Pakistan to get it, because seriously JF-17 might not meet the requirement for too long if the Indians started flying the T-50 and Rafale.
Other nations like those in the latin America that are against US, will also be interested in this aircraft.
Yes... although Iran being sanctioned will not receive the aircraft (not easily) but, China could always sell the tech and not the entire aircraft if Iran is interested, and let Iran build their own stealth aircraft with the new technology, even with a couple of Chinese engineers as advisors.