Doubtful. The beta 4/5 thing just supports the theory that it was meant to be 2 weekly but got delayed due to dev centre hack. Bearing in mind that there's only one more beta before the GM on sept 10th, I suspect we'll get beta 6 next week, leaving a 3 week gap to GM.
That means nothing. Apple could've been planning to release it this way all along. They usually never follow patterns with the iOS betas.