Hey, can't wait for the update. Mabye you could use the checkpoint blocks to power redstone that goes to a piston that pushes the cube out of somewhere in the ceiling, like the dispensers. This would work because the cubes have gravity : D
EDIT: May I "borrow" your old map, edit it and then update it as my own? Of course I will give you full credit, I just want to keep the original alive.
In the trailer video, it even shows the cube falling out of a tube from a ceiling, which was pushed by a piston.
And no, you may not "borrow" my old map, edit it, and/or update it as your own. I don't want you to, even if you do give me full credit. The old map is gonna be way worse than the new map, anyways.