The trouble with BGAs is that you need about 10 layers to get the pins broken out.
A small factor Due is in the list of boards that will come out.
There are a number of issues to solve ... for example with such a big processors it becomes hard to make something that would fit into a breadboard without removing access to most of the pins.
For example: Is it important to have the two separate USB connections or just the "native" connection would suffice?
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