Another set of questions comes to mind:
Is there any demo to show the performance of the new BSP (especially with shaders)?
Is it possible to combine static shadows with shaders?
How about static geometry in BSP levels? Do they get static shadowmaps and is it possible to combine them with shaders?
How good is clipping of static geometry in BSP?

I think a good indoor scene-management is a fantastic marketing argument. ABT is quite useless for big indoor scenery. So the pro-edition could be a good deal if someone wants to make shooter-games. But we need the chance to check how good it is.