Microsoft have just announced that they are re-starting their Visio Insights blog …. after 4 years! See https://blogs.msdn.microsoft.com/visio/2016/06/28/visio-insights-is-back/ .
We have missed it!
Update 2019 : Replaced with https://techcommunity.microsoft.com/t5/Visio-Blog/bg-p/VisioBlog