Today Jeb posted an update on the status for version 0.9.0 and what he has been working on. Up until now new controls were rumored to being worked on and now it seems that UI tweaks along with new controls has been confirmed for 0.9.0 along with the addition of Slimes. As for other rumored features, it looks like Skins may be heading our way finally and officially instead of having to get creative to use skins.
This new update is labeled as a major update, most likely due to the addition of Caves to the game. As for when version 0.9.0 will arrive, nothing concrete has been announced yet.