Even once they have the CA it needs to be added to browsers which will take time. Taking into account release cycles of embedded devices (read phones where the manufacturer hasn't released an update), summer 2015 seems rather optimistic.
But there is a lot of paperwork to be done, and a lot of engineering to be done, and a lot of things to buy and people to hire, in order to get a CA operating.
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Let me be clear here: I'm not complaining that I don't get my free cake now. I do think however that most people at the EFF and Mozilla would agree that we needed something like this a couple of years ago. In that context I think it's a least noteworthy that they decided to wait until other parts of the system are ready.