Anand Lai Shimpi in his iPad Mini Review:
If you’re expecting next year’s mini to have a Retina Display, I wouldn’t hold your breath.
John Gruber adds:
The iPhone went retina in the fourth generation; the full-size iPad in the third. Seems like too much to ask for the Mini to do so in its second.
I think looking to a perceived pattern of past generations is a red herring for when Apple may or may not add a retina display. Each got a retina display when it was possible at a given product’s price point.
I wouldn’t be surprised if the iPad Mini doesn’t gain a retina display next year, but I don’t think there’s a specific past pattern to predict that.