Here is my dream specs and concept for the 2016 Moto X:
It would have a size choice in Moto Maker, like picking a T-shirt size.
It would have a similar design to the current Moto x Pure/Style with the aluminum frame but the back would be a LOT less curved to support larger batteries. The back and battery would be user removable and contain an sd card slot.
There would be the added option of Kevlar and carbon fiber backs.
The screen would be a return to AMOLED tech and would have an RGB sub-pixel arrangement.
It would be basically like a RGB version of the Note 5 display with better viewing angles, high ambient light performance and three calibration modes: True-to-Life, Super-Saturated and Custom.
Protecting the front of the screen would either be the shatter-proof tech from the Turbo 2 or a plastic shatterproof screen with a factory applied gorilla glass screen protector for scratches and dents and free life-time replacements of said screen protectors.
It would have stereo speakers with low profile grills similar to Xperia Z3+.
The software would be normal Moto UI with a theme engine to change looks and a software feature store where you could add software features (such as Moto voice or a multi-window feature.)
The camera app would have a regular mode which would mainly be a UI improvement over the current one and a pro mode with features and manual controls to rival even the LG G4.
Specs:
Sizes
XS:107.3 x 56.95 x 9.73 mm
S: 125.36 x 67.11 x 9.53 mm
M: 136 x 73.01 x 9.24 mm
L: 146.05 x 78.74 x 8.995 mm
XL: 157.37 x 85 x 8.7 mm
Screens
RGB AMOLED w/ Shatter Resistant Tech
XS: 4.08" 900 x 1600 screen with 450ppi and ~75.71% Screen-to-Body ratio
S: 4.9" 1080p screen 450ppi ~78.59% ratio
M: 5.37" 1080p screen 410ppi ~80.08% ratio
L: 5.83" 1440p screen 504ppi ~81.51% ratio
XL: 6.32" 1440p screen 464ppi ~82.33% ratio
SoC
Whatever ends up having the highest performance/power consumption
14nm Quad-core snapdragon 82X with custom kyro cores and adreno 530
OR
Samsung Exynos 8xxx
OR
Apple A10 ( I Wish!!

)
4096 mb LPDDR4 RAM
Storage options: 32gb, 64gb, 128gb, Micro sdxc compatible
Camera
GOOD
OIS
25 megapixels
Dual LED flash
Aperture size F1.8
Sensor size 1/2.4"
Video
4k fps 30fps 1080p 120fps, 720p 300fps
Networks
Universal band support on at least all major carriers in the country the model is being released in.
For example, the Moto X Pure Edition is a US model and it works with all the major carriers in the US.
Battery: Removable
XS 2300 mAH
S 3100 mAH
M 3550 mAH
L 4000 mAH
XL 4500 mAH
Pricing(32gb, 64gb, 128gb)
XS: $379, $399, $439
S:$419, $439, $479
M:$439, $459, $499
L: $459, $479, $519
XL:$469, $489, $529
Wood and leather backs would add $25. Carbon fiber and Kevlar backs would add $40.