I think that one level that I think you're making a reference to could actually be possible if the developers made it so the licorice swirls spawn during Sugar Crush.
The new conveyor belt is better than the old one (that one was basically pink slabs on a stick) but I don't really like the Toffee Swirl design since it's harder to tell how many layers it has since it alternates between 2 colors and waffles have 5 different colors so I can just look at the top layer.
One booster gives you 5 more moves and the other one adds 5 moves to the timer of every bomb on-screen. The bomb is about to explode makes more sense because the bomb didn't actually visually explode.
I think they mean that players who have beaten all the levels should be able to still get rewards for winning the latest uncompleted level (maybe having only the last level count?)