There’s never been much chance that Apple was going to release a new iPad mini with Retina display before later this year.
Although it’s true that Apple refreshed the fourth-gen iPad last just eight months after introducing the third-gen iPad, that refresh had the hallmark of being an exception aimed at making sure every iOS device was compatible with the new Lightning cable.
So it’s unlikely we’re going to see a Retina iPad mini this spring, and here’s further proof: current iPad mini sales aren’t tapering off, giving Apple no reason to upgrade their mini any earlier than necessary.