I would be interested in knowing the financials behind this. Video is expensive to serve and store: these costs become more noticeable if they get a lot of growth of Video uploads.As much as I love HTML5 Video , it drives up your storage and transcoding costs by two to three times if decide to support WEBM, OGG and MP4(though I see they are not doing MP4). If they are transcoding the video ,then that would add to CPU costs. Of course, I am basing my assumptions of AWS, Zencoder etc. I would love to hear how to plan to contain costs.