Okay, I have a really hard time believing that spec-sheet.
A 30MP camera is borderline impossible. They would need a really big sensor to cram that much pixels in without sacrificing pixel-size. Given how Samsung's gamble with the 12.2MP "Dual-Pixel" shooter seems to have paid off, I doubt they would go and throw that in the water in favor of a really high megapixel count that would almost certainly require a larger sensor and more space in the actual phone itself. I'm not talking a 1/2-inch sensor. Likely something closer in size to the Lumia 1020's 2/3" sensor.
Cramming a 4200mAh battery in such a petite frame with a 5.2-inch display (that likely has trimmed bezels) just seems like an impossibility unless they make that thing really thick. I'm all in for larger batteries, but knowing OEMs, I doubt they'd make a phone really thick for more battery. A shame for some of us heavy users, but that's the reality.
It's stuff like this that make me have to constantly remind people to peg back expectations so that you won't be bitterly disappointed by reality.