I've heard that Gameduino (not Gamebuino) uses that chip in order to unload the AVR's CPU time from rendering the picture. I'm wondering if it's possible to get a development board with it somewhere at a cheap price because it's just a chip. I don't know why breakout boards cost so much more than one little chip. If I could get a schematica of that chip and an XMEGA and know how to solder TQFP100, I'd do it myself.
I'm very disappointed with the poor speed of XMEGA's MSPI which I expected to be 64MHz (darn mystifications!) so I cannot really put enough fast speed to a serial display, hence I quit the driver porting project after reading the datasheet to set the baudrate. According to my calculations, with such low speed, it's impossible to render the picture enough fast for a 16-bit 128x160 screen.