C# REPL outside Visual Studio

Question

F# has a REPL (read–eval–print loop) F# Interactive, C:\\Program Files (x86)\\Microsoft F#\\v4.0\\Fsi.exe.

I understand C# now has its own interactive REPL,

Answer 1

The only executable I found is C:\Program Files (x86)\Microsoft Codename Roslyn CTP\Binaries\rcsi.exe, which can execute .csx files. But it doesn't seem to actually support REPL.