Did they say they were going to do that for sure, or is it just the "preview" you saw on the finale. Because I assumed that the preview was to be a teaser for things we'll see that will lead up to that part; in other words, I'm thinking they won't really start off 5 years in the future, but instead will flash forward 5 years with Mary Alice talking about what is going on. Then I figured she'd say something like, "but to better understand how they got to this point..." then they'd go back to present time.
That is what I've assumed... fwiw.
