Seriously, that one podcast has completely confused the discussion of the 12" and Diorama lines.
Now, the official diorama announcement said: "The designs for the Star Wars 'Versus' dioramas were drawn from the most dynamic and dramatic confrontations in the films, and the environments will seek to capture some of the Star Wars Saga's vast landscapes, immense creatures and varied locations - but in a reasonable size that collectors can display on a desktop or hang on a wall. The size and scale will vary, but most of the 'Versus' dioramas will be in approximately 1:9 scale. The Star Wars 'Versus' environments will vary greatly in size and scale."
I listened to the podcast only once, but don't remember hearing anything more revealing than this. That is, unless the talk turned to the 12" figures somehow... my mind must've blacked that out.