Two data points might merely be a start of a pattern at best though. And even with some sort of a pattern it still doesn't mean the next release would have to follow it for some reason.
Plus there's another equally fitting and possibly even better "pattern" that relates to the expiration dates of the betas: beta 1 is set to expire on July 24th and beta 2 was released exactly one month before on June 24th (a Monday); beta 2 is set to expire on August 8th, and beta 3 was released exactly one month before on July 8th (also a Monday); and now beta 3 is set to expire on August 29th and one month before that July 29th just happens to be a Monday too (although three weeks after beta 2 release instead of the previous two).