I determined that releasing the game without multiplayer capability was not wise. So, I pulled it from the app store in early March to implement Game Center and bluetooth game play. As usual, it took longer than I thought. I had both Game Center and bluetooth basically working in a week but it took another 3 weeks to to get it working the way I wanted. Multiplayer adds much more complexity to everything.
I am so glad I decided to pull it back. Multiplayer is so fun.
So, I submitted the new version to the app store last night. Not sure how long it will take to get through the review process.