FileMaker iOS App SDK
So if you have Xcode and an iOS app developer account with Apple, you should be able to build an iOS app which includes your fmp12 file as user interface.
You can have your own icon, URL scheme, startup screen and much more.
Now I wonder if a plugin SDK for iOS is coming, too...
see help.filemaker.com/app/answers/detail/a_id/15531
and help.filemaker.com/app/answers/detail/a_id/15582/