It's been awhile since we've talked about SD-WAN, aka Software Defined Networking or SDN. That's mostly because there just hasn't been much movement on it, aside from incremental upgrades from companies like Meraki and ADTRAN which have been active in developing SDN ideas.
However, it's starting to look like things are changing. Recently, Gartner made the rather startling prediction that investments in SD-WAN installations are going to increase tenfold in the next four years, describing it as a "highly disruptive force that is dramatically reshaping the enterprise router market." Likewise, Cisco also seems quite bullish on the future of SDN, in a blog post outlining what they soon expect to see from the technology.