will roku play flash streams?

To be honest, we get VERY few requests from content owners/publishers/distributors for Flash (I can't remember the last time lack of Flash support was a showstopper). Anyone that is trying to push their content to the TV or mobile devices is moving towards (or has moved) more compatible encodes and transports, typically either h264 in an MP4 or h264 via HLS. I would not hold out waiting for flash support on Roku. And with OVPs (Brightcove, Ooyala, etc) and services like encoding.com getting existing content into a compatible format is not a major hurdle.