If I custom order an iMac (high model with extra graphics ram) on the Apple Online Store when its released (for education) can I pick it up in store?
Not sure what this had to do with my post, but yes you can have BTO models shipped to store for pick up.
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At the Feature-Specific Requirements - AirPlay Mirroring tab it says iMac (Mid 2011 or newer). It says the same for the Mac Mini.
Unfortunately all that means is that they're believing there will be new models of the iMac and Mini eventually. Doesn't really say much about how imminent they are.