When I started the game up this morning, it popped up a message: "ATTENTION Update the game to continue." When I click the Update button, it sends me to the Appstore page, but there's no Update button there. Restarting my phone doesn't do anything, and I'm unable to get past the Update notification.
I'm on an iPhone 5SE, fully updated, in Canada, and have been playing since a few days after first launch.