I remember hearing Snow say "We're Back" in the preview as well - all the people standing by the red line in Storybrook were standing together dressed in their FTL costumes. I think that everyone else remembering their time in SB makes sense as part of the "price" that Rumple said Regina (and in turn everyone else) would have to pay for destroying the curse.
So a couple of thoughts...
Now that we know the Wicked Witch (WW) is in FTL we will probably have a bunch of fun back-story episodes...especially about how she gets to FTL. (Maybe when she melted in OZ, it actually transported her to FTL
)
I wonder if most of the second half of the season will focus on 2 components - trying to get Henry and Emma to believe and return... AND... why Snow and Charming are in grave danger. I don't think I could handle stretching out getting Henry and Emma to believe for that many episodes...
To echo many others..Rumple better not be dead
I like that Regina has changed, but I also really liked when she used a bit of her darkness to get Henry's heart back...I hope she is good, but I'd love to see her and the WW go at it