Totally agree on F#. I'm 100% paying attention to C#, VB, and F# and making sure everyone kicks butt.
https://visualstudio.uservoice.com/forums/121579-visual-stud...
https://github.com/aspnet/Home/issues/236
http://www.infoq.com/news/2015/04/VB-Core
http://weblogs.asp.net/scottgu/introducing-asp-net-5#after-c...
https://social.msdn.microsoft.com/Forums/vstudio/en-US/22697...
These days I'd lean towards JSON.Net before anything XML based if I can avoid it. WCF could use a little love too.
For example, we have a customer in health care area, where many of their researchers are using VB.NET for prototyping.
The type of stuff people on HN would use Python or R for, they use VB.NET.