I bought mine a month before the new generation came out.
At this stage, I would much rather take a decrease in overall performance when projecting rather than not having that feature available at all.
I understand that some software emulation would have to compensate on older models but if some third party airparrot can do it, so can apple.
I know it doesn't fall in the perfectionmist OCD schema that apple got us used in their equipment. But some features are just so important. AirPlay is the sole reason I upgraded to Mountain Lion. I need to present from laptop wirelessly in classrooms to students. And now I am looking at a $999 investment to do that....
I hope this get's fixed. After buying a piece of equipment like this I expect to use it for a while to feel that is brough a return on investment. Apple did a great job so far in accomodating their latest OS on older devices in iPhone and iPad line of product. If they could do this in their mac products it would be great.
Thank you! And btw, the new iCloud integration across devices is awesome!