As it's still vacation season in Europe there are no updates on release schedules, or new information to report. This is likely to be the case for the next few weeks at least.
-A Qt 5.9.2 release is still scheduled for August, and a 5.10 release for November.
-The 5.10 feature freeze is scheduled for August 8, with an alpha release on August 31.
*Note: these dates may change as development proceeds.