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The antenna design will be an issue with an pcb of that size particularly when combined with the coin cell battery that creates a huge ground plane. I would suggest to look at different Bluetooth low energy modules to get a starting point. They often include the antenna design and have...
Do you need only full duplex speech quality audio stream (hands free) or do you require also A2DP which allows streaming of high quality stereo sound? Since you need to include the AM/FM radio I suspect that you are looking for the latter one. One module that includes A2DP and has buildin codec...
https://www.sparkfun.com/products/8952 can handle A2DP and HFP profiles in parallel.
Example project: https://blog.makezine.com/2009/11/02/star-trek-bluetooth-communicator/
Please read simple article describing the differences between different versions of Bluetooth:
http://www.chipscoop.com/2012/08/what-is-bluetooth-smart.html
In short: You cannot upgrade 2.0 or 2.1 chipsets to work as 4.0 dualmode.
Basics of Bluetooth from Wikipedia: http://en.wikipedia.org/wiki/Bluetooth
Simple introduction to the latest Bluetooth Smart or Bluetooth 4.0: http://www.chipscoop.com/2012/08/what-is-bluetooth-smart.html
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