Sent out to Dennis Bednarz and others on Twitter, LinkedIn clarified that Windows Phone versions of their app won't be closed:

Seems like LinkedIn is not dead on Windows Phones yet @DthorpL pic.twitter.com/NnAmyBqN8d — Dennis Bednarz (@DennisBednarz) 10 January 2017

Still, hopefully Microsoft is working on a more feature-rich UWP version of their LinkedIn service. We'll just have to wait and see!

Original article:

It's likely been a long time coming given the lack of updates, but the LinkedIn app for Windows Phone is officially set to be retired on January 15. LinkedIn has started alerting those who use the app via email without actually mentioning Windows Phone by name. Instead, LinkedIn says it is retiring "older versions" of its apps, and recommends that users switch to either the Android or iOS app.