Realtime dynamic blur of the Focus background image was supposed to happen and I hope it still does. Bigger fish to fry right now. You can kinda see a bit of this when moving cab mics around—the grille cloth disappears when you touch the focus lens so you can more clearly position it on the speaker. For whatever reason, that one made it through, but it doesn't currently fade gradually, it's either on or off.
There are approximately 9 zillion UI things the Design Team planned for but haven't been implemented yet—some big, some tiny. We'll be addressing all sorts of things as time goes on.