Is there a store upgrade after the first one?

[iofuu]

Has anybody unlocked the next store yet?

 

[McRibbie]

There's currently only a bigger Nook's Cranny in the game.

I think they're going to add further upgrades in with updates, but I'm unsure as to whether it's going to be Nook "N" Go through Nookingtons or something else.

 

[DinoTown]

There's been an upgrade confirmed from datamining and stuff, and people have said it takes 3/4 weeks of game time to unlock it, but I've yet to see anyone actually say they have it.