Programmable Ultegra Di2 is Dura Ace as well? 7900 Computer?

[morrisond]

I was reading a write up on Ultegra Di2, it says that the Group is programmable using your own computer.

What's programmable? Can you put the FD shifting up one one shifter and down on the other? Can you do this with the RD as well?

Finally is the 7900 Computer finally available? Apparently it eliminates the Ugly junction box that hangs down on Di2.