It looks like ha55ii has been working incredibly hard on a new dust engine. It operates easily on my machine at 50 fps with a full dot count, where as the original peaked at 25 on my system.
Give it a time until more elements are added, probably there are going to be new elements that will make powder game 2 better than the first one. I bet there is going to be another discussion about if PG2 or TPT is better sooner or latter in both forums...