I expect both of these models to be in high demand. I sat down with a representative earlier today and he said that while the Blackmagic Pocket Cinema Camera will begin shipping in July, they are expecting a high demand that will lead to a hefty backorder log.
In short, if you want one, pre-order it now.
You can pre-order the Blackmagic Pocket Camera here at B&H Photo.
You can pre-order the Blackmagic Production Camera 4K here at B&H Photo.