OK, I got my shiny new APM2 purple board on Tuesday. I powered it up with the microUSB cable, installed 2.1a and everything checks out. Easiest Out-Of-Box experience ever. I can't find Arducopter APM2 docs yet, but I found the ArduPlane wiki now has an APM2 section, close enough.
Attached my ESC, minding polarity to the outputs, but I can't power up the board. I checked the ESC, I have 5v out, then I tried a spare ESC, same thing. The APM2 shows 5v with the correct polarity on the output rail, so there must be a missing jumper somewhere.
But I can't find any jumper info yet...
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OK, found it. Poking around with the DVM a little, J1 needs to be jumpered if the ESC BEC is going to power the board.
I know the documentation is a little lean at this point, but for $199 it would be nice to at least throw in the jumper itself so the board can be used "as shipped". Gotta find one of those small a$$ jumpers now...
You're ahead of me! I haven't finished that part of the manual yet ;-)