Optoma showcased the upcoming UHD51A in advance at CES 2018, and this voice-enabled 4K home theater projector, and got good reviews from slashgear.com:

” This isn’t just any 4K home projector. This 4K home projector works with Alexa. As such, voice requests of projections of all sorts will easily appear, courtesy of your Amazon Alexa assistant. Have a peek at our Optoma UHD51A hands-on for more information.”