I got it working on my 2012 MB Pro. Come to find out, after I rebooted the first time after installing Yosemite my bluetooth was not working. I had to hold shift, ctrl+option, and power when turned off and plugged into power. After I did that it reset my bluetooth and it started working on my macbook pro. Once I did that, handoff is working.
Question I have is that I can't get it to work on imessages, trying to type a text on my iphone it shows Chrome in the handoff window and its not even an open or active app.
Also, I use the mail app on my iphone for my company email but on my mac I use outlook. So when trying to type an email for work and handoff pops up and I try to open up handoff it cant do it because that email address isnt configured in the mail app on mac. Bummer.