Saws can be fickle that way, some feel like they are cutting more than they really are and some act like they aren't doing much at all, when they are really cutting great.
From the little bits and pieces of pre-view I've seen, it would "appear" that other than the fuel delivery system the 564xp is "styled" much like the 592xp. If this indeed is the case, then maybe good things can be expected from it, maybe that's wishful thinking if nothing else. One thing for sure, it has a lot of people's attention.