Wine Mono 0.0.8 is the new release this week, due to a botched 0.0.6 release it immediately follows 0.0.4. Wine Mono 0.0.8 features updated Visual Basic class libraries from upstream, rebases on Mono 2.11.4, beginnings of support for ActiveX controls inside winforms, ACL support on Windows, WINE_MONO_TRACE for logging all transitions between native and managed code, 64-bit registry entries inside the MSI package, and various bug-fixes.
The project's GitHub repository describes the project as, "Wine Mono is a package containing Mono and other projects, intended as a replacement for the .NET runtime and class libraries in Wine. It works in conjunction with Wine's builtin mscoree.dll, and it is not intended to be useful for any other purpose."
More information on the new 0.0.8 release is available from the release announcement.