This news comes from highly trusted sources close to the production that reveal the shoot will run through the end of September. They also confirm that most of the principle casting on the J.J. Abrams sequel is now complete. Expect announcements to start any day.
J.J. Abrams confirmed in late January that shooting is set to begin in May, though an official day has not yet been announced. No story details have been released at this time, and it's unclear if LucasFilm will reveal any when the first casting press release is sent out. It is unlikely that any solid details will be revealed aside from actor's names and possibly the roles they are taking on.
With shooting set to wrap in September, the filmmaker and his crew will have over a year to work on post-production.