iPad Mini is confirmed to have retina display:
MacRumorsLive @macrumorslive 1m The one most requested feature to add to the iPad mini: A beautiful Retina display. "That's what we're going to do today."
MacRumorsLive @macrumorslive 50s
7.9-inches, 2048x1536 pixels, same as the iPad Air. "The experience is just amazing."
MacRumorsLive @macrumorslive 30s Also includes 2x faster Wi-Fi with MIMO, 5-megapixel iSight Camera. Comes in silver/white, space/gray black.
MacRumorsLive @macrumorslive 20s
Priced at $399 for Wi-Fi, $529