The M10-P looks more like a classic Leica from the 60s than the standard edition of the M10. For some shooters that's enough to justify the premium. For me, the biggest upgrade here isn't the aesthetics or the touch screen, but the new shutter.
Big, bright optical viewfinder with focusing patch; Compatible with lenses dating back to the 1930s; Very quiet focal plane shutter; 24MP full-frame image sensor; Dust- and splash-resistant build; Add-on EVF available; Wi-Fi
Expensive; Rangefinders are not for everyone; No video recording; No Android support for Wi-Fi