Cisco® Visual Networking Index (VNI), an ongoing initiative to track and forecast the impact of visual networking applications have released a new forecast document. Cisco Visual Networking Index: Forecast and Methodology, 2012–2017.

Some highlights from the paper relating to Video delivery:
• Globally, consumer Internet video traffic will be 69 percent of all consumer Internet traffic in 2017, up from 57 percent in 2012. This percentage does not include video exchanged through peer-to-peer (P2P) file sharing. The sum of all forms of video (TV, video on demand [VoD], Internet, and P2P) will be in the range of 80 to 90 percent of global consumer traffic by 2017.
• Video-on-demand traffic will nearly triple by 2017. The amount of VoD traffic in 2017 will be equivalent to 6 billion DVDs per month.
• Content Delivery Network (CDN) traffic will deliver almost two-thirds of all video traffic by 2017. By 2017, 65 percent of all Internet video traffic will cross content delivery networks in 2017, up from 53 percent in 2012.
Full details from Cisco here