Don't hold your breath on that one. XBMC is very resource demanding and the SoC on Chromecast is not only not documented but also very low on resources. Howeve

Don't hold your breath on that one. XBMC is very resource demanding and the SoC on Chromecast is not only not documented but also very low on resources. However, they might be able to grab the private keys from it and use them to build add Chromecast emulation to XBMC.