Hopefully some more info on general gameplay, like how the converting-corrupted-land-to-purity-machine things work.
Terraria Community Forums
RealSaucer
The Ice Cube
Otherworld news.
Dg-vr
maybe an updated possible release date, so it can build some hype ;p
The Ice Cube
Well, they kind of overhyped 1.3 in my opinion, so it'd be better if they just kept working on it quietly.