It's as easy to develop for as the car player - perhaps easier in some ways, as you can plug in a USB keyboard and get a console up on the LCD screen.

I believe Tony got DisplayServer working on his - at least partially.

No feature sets are tied down for a second version - it's going to depend a lot on feedback on the first one! HPNA is there as the cheapest and easiest way to create a network of Receivers (for those who don't already have a home network). USB Master is there to accommodate Ethernet and anything else we might want to support in future. There's nothing stopping you building your own kernel for other USB network interfaces (e.g. wireless) as and when they find their way into 2.4.

Rob