LOL, then you woke up
joking
The 12 hour On Screen part, isn't happening anytime soon. Even the best Android battery phones, like the Note 2, Droid MAXX, One M8, are lucky to push 7h maybe 8h On Screen time, if you do everything you can to tweak it. To get 50% better battery life than the Note 2 or Droid MAXX, you'd need a 4,000mAh battery + keep the screen 1080p, not the newer 1440p res, and run the 801 processor. And they could make a phone with a 4,000mAh if they wanted too, especially Motorola, they were very good at smashing down the size of the large batteries to still fit in an overall thin package. I'd gladly take a phone just a hair thicker, for a 4,000mAh battery.
Seems like we take one step forward, and one step back as far as battery life. We'll get larger batteries like 3,000mAh, and more efficient processors like the 801, but then they put in a 1440p super higher res screen which takes up more power.