Hello, I know that my current iMac (late 2009) can be used as an external display using the Mini DisplayPort. So for instance I could connect a PS3 or XBox 360 to it using some special HDMI to Mini DisplayPort adaptor (like Kanex XD or some other thing made by Belkin). Now the question is, can I do the same with the recently announced late 2013 iMac? If so, is it possible both on the 21" and 27" models or only on the high-end 27" model? Also, which kind of adaptor should I look for? Thanks in advance!