The site HitFix is reporting this as confirmed news although there is still no official confirmation from Lucasfilm and/or Disney. This is the second report regarding the Episode 7 filming schedule in the last few days. The previous report was with actual dates (May 19 – August 8)…
Multiple sources now have confirmed for us that “Star Wars Episode VII” is set to start shooting mid-May and will run through September of this year, and most principal casting on the film is complete, with many announcements still to come. While Abrams had mentioned May during the TCA press tour and there had been speculation about the summer date, the full production schedule was finally confirmed for us.
So you choose which one to trust. It feels like an official announcement is imminent.