I don't think we'll be seeing a Retina iPad Mini until Apple makes the transition to 20 nm TSMC chips in 2014. This will also allow Apple and Sharp to improve IGZO yield at the higher resolution.
But the Mini will get a significant hardware upgrade in 2013 to keep up the sales momentum, probably one comparable to the upgrade from the iPad to the iPad 2.
But the Mini will get a significant hardware upgrade in 2013 to keep up the sales momentum, probably one comparable to the upgrade from the iPad to the iPad 2.