what you do you expect them to be able to do with eachother ?
you can transfer files or data between them unless you find some 3th party program which does that
this is what ios devices support in terms of bluetooth profiles
http://support.apple.com/kb/ht3647
this is the full list of all bluetooth profiles (even your computer only support a fragtion of the list)
http://en.wikipedia.org/wiki/Bluetooth