http://hometheaterhifi.com/reviews/video-display/hdtv/leeco-super4-x55-55-ultra-hd-tv-review/ Confirmed: it runs Android TV. Top notch picture quality performance out of the box, for under $900. Amazing. Also the Amazon Prime app is available, but not pre-installed.
Don't buy this tv. Picture is great but interface sucks, android tv is tweaked and their customer service is horrible. Also doesn't work with external speakers.