Maybe tomorrow, maybe never. We don't know if 9.3.3 will drop before or after WWDC. They might be running weekly cycles or 2-weekly cycles. I guess we'll find out tomorrow.
I would say likely before WWDC or out that day. I think they want to be done working on iOS9 updates and betas and move the focus completely to 10 beta feedback which obviously will be huge at first.
I dont see this beta having more than a week or 2 life in beta as its a tiny tiny bug fix update being a x.x.1