I heard about an upcoming phone that moto is going to use as their flagship phone in the first half of 2013. This is from a very reputable source.
Apparently this phone is called the "X Phone" or something along those lines and has buttons on the back of the phone. He said that a camera button is in the middle of the phone with volume up and down buttons on both sides of it all on the back face of the phone. He said it is supposed to be more ergonomic while holding the phone.
He also said that the phone is going to get every piece premium piece of technology that moto has, so you can expect a quad core processor (s4 pro likely), 2 GB ram, LTE, Maxx style battery etc.
He also talked a lot about the phone having a ton of new voice command features and swiping gestures to accomplish tasks. He said the idea of this phone is to completely change the way we ergonomically have to interact with our phones. I.e. that it would take less than two seconds from the phone being in the pocket to using the camera. These features would be built on top of android as a stand alone proprietary suite app so that moto can be dedicated to updating to all new google updates in 3 months or less.
When I asked about a moto nexus he said there is currently no plans as everything they have is being put into this phone, we can expect a massive ad campaign for it in 2013 to promote it. He also said that while it sounds terrible once you hold one and see how it works you will like it a lot more.