If I may be so bold as to chime in on this thread:
1) The new interface looks amazing. I cannot wait to see it fully functional! I forked QLC+ 4 a few weeks ago to begin my own work on a new UI; it looks like I won't have to bother! Hooray!
2) I hope you'll please consider 3D visualization as the last priority, maybe release a beta when everything else is working... I say that out of personal interest, as I've already purchased Capture, the commercial 3D visualization package.
Having all the other features complete would be enough for me to be happy...