When will we see some more updates? The 2 most urgent features are:
Environment Map with Backplate (set to screen)
So far, so good - even Arnold does not support Perspective Control Tilt Correction, whereas Cycles does.
The next update will definitely include render region support. I'm working on that feature right now and it is nearly done.
Backplate support is something I'm still looking into. I may be able to include it in the next update but I'm not sure yet. I'll post here with any news I have about that.