I just got off the phone with Nexus device support for the second time and I will likely be either returning mine for exchange or refund.
1. Issue #1 - Bluetooth functions only for numeric dialing, no voice dialing or other voice actions seem to work. Others appear to have the same issue. You can speak the numbers you wish dialed and that's about it. This pretty much makes the phone useless to me since I use bluetooth almost exclusively with my phone and this feature has worked in every other phone I've owned. Maybe others can confirm whether this is unique to me. Android ver 4.2.1.
2. Minor issue, but also related - I can not use a stereo headset with my phone and expect the handset mic to work. Again - something that simply works in every other smart phone I've owned. You plug in a stereo headset (3 conductor earbuds only, not 4 conductor with mic for example) and the phone ideally recognizes the lack of 4th conductor and sends output audio to headphone while using handset mic. So, if you wish to make a call, you can do so. And if you wish to communicate with your phone using verbal commands you may do so as well. You may get "some" functionality using a 3 conductor headphone, however try making a call to someone and it simply doesn't work.
I don't think my phone issues are unique, but perhaps I got a lemon? Nexus support can't seem to confirm whether or not its a known issue.