Does no iOS 6 beta 5 (for a month) hint at a BIG HIDDEN FEATURE?

Does anyone else find it suspicious that Apple has not released iOS 6 beta 5 yet? It has been over a month since beta 4 was released. Usually, Apple releases the betas on an every other week cycle. Give or take a week. (3 weeks in between isn't out of the norm).

My thoughts are that:

1) There is something big that they are saving like Siri. They will announce it on Wednesday, and release it with the RC. Of course the downside is that it will not have been mass beta tested.

2) iOS 6 is just not that big of an update, and 4 betas was enough to iron out the bugs?

Am I the only one who found this month long wait suspicious?