Macgasm has a chart, and it shows may users won’t be happy.
Handoff is the very cool new feature where with OS X Yosemite, you will be able to hand off things from iOS to your Mac, such as composing an e-mail or looking at a web page. And even answer phone calls from your cell phone via your mac and it’s microphones.
That’s a no for non 2013 MacPro’s. Hopefully a 3rd Party bluetooth 4.9 adapter will solve that (or some 3rd party software), as it shouldn’t matter if it is built in or via a 3rd party adapter. Or at least we can hope!