Support for C# 6 Language Features
C# 6.0 is currently in Preview with Visual Studio 2015 preview. As I am starting to use the newest version of VS, I am exploring the behavior of the new language features, including the new nameof operator, string interpolation, the null conditional operator, index initializers, etc. I instinctively go to LINQPad to test something out including these but then realize it is not yet supported :(

LINQPad 5 with C# 6 and VB 14 language support has now been released.
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Keith Hall commented
LINQPad 5 RTM has been released now (with an installer) with support for C# 6. So I believe this can be marked as completed.
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Bradlee Landis commented
LinqPad 5 has a lot of the features. They don't have an installer though, so you just have to extract the zip to somewhere on your drive and run from there.
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Joe Skeen commented
Here is a blog post on the new features in C# 6.0:
http://blogs.msdn.com/b/csharpfaq/archive/2014/11/20/new-features-in-c-6.aspx