Robi,
one of the first things you have to learn as a fan of JMJ is: patience!
Jean Michel said, that the French dates will be announced first and more will follow thereafter. If they don't do any more concerts this year and seen that the French dates are in March next year, so 9 months away, there's enough time. I'm sure the Jarre team is working very hard at the moment to negotiate with concert organizers etc. If there are dates fixed they will let us know. But as long as they are negotiating and don't have fixed dates to tell, they won't spread rumours. So, just be patient, wait and see.
Regards,
Matthias