If you are in the UK I,d be happy to take it off your hands for what you paid for it - PM me if so
It's a shame I didn't find out what the full kit price was going to be.
If I was you I would keep hold of the board and populate it with only the components you actually need.
I,m assuming that the ATMega will be pre-programmed in the full kit version, but as the PCB is available
seperately, then surely the programming data should be available as an option?
As far as I'm aware, the ATmega won't be programmed, however the reason I have a Gertboard right now was to put together some means to use the ATmega on the Gertboard from the Pi.
So I've been through a few iterations and came to the conclusion that the easiest way to do it would be via the ATmegas ISP interface and use the GPIOs SPI pins to program it. So I've put together a version of avrdude that has some patches published by others to use a Linux systems GPIO pins via the /sys/class/gpio interface, and set the defaults for the Pi. It's not the fastest ISP programmer in the world, but it gets there... It also means you can run (e.g.) minicom on the Pi's serial port jumpered to the ATmegas serial port and see things happening on the ATmega right at boot time without having to start/stop the serial console in the Arduino IDE.
I've also put together a script to initialise a blank ATmega (168 or 328p) with the right fuse settings to make it work at 12MHz (Otherwise it defaults to 1MHz using its internal oscillator) and make sure all the flash is avalable for program use. (a serial bootloader would use 2KB of Flash, however if you're writing a 32KB program for an ATmega on the Gertboard then perhaps it's not the right platform for you!
I did go down the serial programming route, but the biggest issue there was that it's running at 12MHz and so it needed a modified bootloader (the baud rate generator is derived off the system clock) - so then there would be the issue of putting the bootloader into it in the first place, and I didn't fancy sitting down with 1000+ ATmegas doing it via my ISP programmer.
(and it's running at 12MHz because that's the limitation of the ATmega at 3.3v)
(And you can use a traditional USB/ISP programmer if you like - it's works fine on the Pi)
So I have modified versions of the Arduino IDE's boards.txt and programmers.txt to work on the Pi and I've been doing some tests using the Arduino IDE with Raspbian to program the ATmegas and it's all working fine.
When the kit is released it should include the manual (written by Myra who was at the Cambridge Rassberryjam event too demonstrating the Lego crocodile, and downloadable off the Farnell site) which has much nicer pictures that I can draw...
If you want a sneak preview, then https://projects.drogon.net/raspberry-pi/gertboard/
is the place to look, but that is subject to change before the official release!