I have noticed a couple of things about DP3.
First, the option for Handoff is missing from my 2010 MacBook. That computer has BT 2.1 (NOT BT 4.0/LE), which means that the Handoff function will not work, at least not according to the reports I’ve read. Removing the setting (Preferences > General > Allow Handoff between this Mac and your iCloud devices) seems to be a good move to eliminate confusion about why the Handoff feature isn't working.
Second, I just got a voice call from a landline and the FaceTime app launched and was ringing. I didn’t realize what was happening until I had already answered the call on my phone, but even without BT 4.0/LE, the ability to take calls on your Mac appears to be working.