“To ensure current players have the best possible experience, we’ve temporarily removed The Simpsons: Tapped Out from the App Store to limit the game’s server capacity to its current players and address connectivity and lag time issues.
If you’ve downloaded the game, you can continue to play. Actually, your experience should only improve as we work on a solution. As soon as we have resolved these issues to handle greater player capacity, we will return The Simpsons: Tapped Out to the App Store.”
While we’ve yet to try the game out for ourselves, it seems that apart from the connection issue, reviews of the game have been largely positive, so you don’t have to worry about the publisher pulling the game permanently. Unfortunately no word on when the game will be back in the App Store, so stay tuned!