Mission Statement

Planescape was cool but it had flaws and is long dead, let's make an update/revision of it. With 5e on the way it's a good time.

Principles

The editions are in flux, so no mechanics.
The planes should be a good place for adventure, even the upper planes or low-level adventures.
Alignment is a blind and sometimes alien cosmic force, not the human condition.
The planes should be big, not by writing 'infinite' everywhere like bad SF adds zeroes, but by evoking hugeness.
Interesting aspects of the planes should be discussed in detail.
The planes should be varied and distinct.