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There were retina minis on display at 4:00 PM EST at the Apple Store in Greenville SC. I'd a taken a picture if I could.

They had rMinis and 1st gen Minis on the same table in Schaumburg, IL at noon today. The sales guys (geniuses?) were trying to tell which was which. I pointed out that the rMini has 2 microphones and the original has 1.
 
Also, i tried the wifi version out at a coffee shop tonight waiting for the store to fulfill my current order and whoa- i didnt "notice" how important the retina screen is until i just started using it outside my house. Huge improvement, yellow or not.
 
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