Thanks, great to know you liked it! :)
Thanks, glad to hear you like it! :) In that particular video with the air balloons the planet was randomly generated, but hand-made planets from Planet Painter could also be used.
Hi! Sorry, can't promise anything more specific than Blizzard-style "when it's ready". :) Not too much free time at the moment. Soon, I hope!
Thanks! :) Yes, I have plans to add exporting to some of the popular 3D formats (such as OBJ or FBX, haven't decided yet).