It will either be weekly or three weeks. We will find out Monday or Tuesday. Weekly means they are trying to kill last minute bugs and we will see 2-3 more builds before the event. If they go to 3 week, we will most likely only see on more build. The last beta usually comes out 2-3 weeks before event. Based on this years new routine, I have a feeling it will be 3 weeks.
It will more than likely stay on the two week course. That gives two more builds (up to developer beta 6) and then beta 7 (GM) landing on the 12th when the event is rumoured to be.