For the most part, I would like to hold off until Minecraft 1.4.3. I'm real sorry about the delay, I really am... This tweet from Dinnerbone is the primary reason I want to wait for 1.4.3:
https://twitter.com/Dinnerbone/status/263638815028166656However, don't hold your breath. That is my intended goal for the IDP, but should I get done with what I'm working on, and then onto the rest of what I need to do, then MAYBE we could get by with 1.4.2. The bugs are my primary concern, but you guys really want a recent version. We shall see....