Interesting idea, but no, Roku doesn't support it. Interesting that it seems that Netflix is the one who seems to be behind this technology in some fashion with support from Google, too. I guess they are trying to compete with AirPlay in a way.
Anyways, good chance we won't know until it's released or possibly on another generation of Roku. Roku doesn't announce or comment based on questions from Forum, Twitter, and/or Facebook posts.
Roku 3, 42" LCD, Ethernet (6.2)
Roku Stick HDMI, 32" LCD, WiFi (6.2)
Roku2 XS, 25" CRT, Ethernet (6.2)
Router - ASUS AC68U
ISP - TWC - 50 Mbps/5 Mbps