It says he's retiring from action movies, so he's probably done with acting/stunts. He might start doing some directing or producing type stuff so I highly doubt this will be his last movie ever.
For the most part, his movies have been in decline for a while so it might be good for him to stay away from acting. Other than Rush Hour, i'm not really a fan of his american movies. His old school Kung Fu movies like Police Story, Drunken Master and Rumble in the Bronx were probably his best works. Hopefully this new one can end his action movies on a good note.
In this article it says he wants to get into serious acting movies so he'll probably still be doing films. Just not any more action or comedy movies.