New rumor suggest multiple materials to pick from when customizing the phone.
http://phandroid.com/2013/07/12/moto-x-customization-rumors/
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If it's a phone you do not like that belongs to someone else it is plastic. If it is your phone and you like it very much it is polycarbonite
1080 for what? If the display size is 4.5 or 4.7 which in my opinion is enough why do I have to have a 1080 display. All this causes is the need for more hardware to power it and a larger battery to go along with that, or poor battery life per charge.
If it's a phone you do not like that belongs to someone else it is plastic. If it is your phone and you like it very much it is polycarbonite