Edison has a Bluetooth 4.0 antenna, which means that as you can see in Bluetooth - Wikipedia, Bluetooth 4.0 can have up to 7 devices connected at the same time to a master.
All available information regarding the Edison's Bluetooth capabilities can be found on Intel® Edison Boards — Bluetooth® User Guide, this document has been regularly updated up to version 7 since its original release in December, so if you need any other information not available on the guide, my best suggestion would be for you to wait until a new version of this document is made available to see if that information is added. Since this question is directly related to BlueZ, you could also post your question in BlueZ » Mailing list
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