WSL2 on windows
For all intents and purposes, Windows 10’s WSL continues as a work-in-progress project. There’s not much to see from the WSL today, which is most likely a result of not having a complete WSL setup around for many users at this time. Windows 10’s WSL packages do not run the latest version of WSL by default. Instead, WSL packages are being built for the newer Windows 10 build 1607 and Windows 10’s current WSL version 1605. However, that may change in the near future if Microsoft finally releases a complete WSL set up for a limited number of users (for example Windows 10 Enterprise users, and other WSL-based deployments of Windows 10).
For Linux users, there are some missing pieces in WSL that are typically considered to be part of the Linux desktop environment (Qt/KDE/ GNOME/ LXDE/ XFCE/ Unity/ etc.). Linux distributions (such as Ubuntu or Debian) often support the ability to run Windows apps and also provide support for some Linux desktop applications (such as Java). This support is usually provided through the Linux desktop environment (either a compatibility layer on top of X or XFCE or through some form of application compatibility layer, such as the GtkWindowsAdapter).
So, with Linux developers working on adding support for a wider variety of Windows applications to Linux, it’s difficult to imagine what else they could potentially add to WSL. So, it seems the major focus on WSL development is to improve support for running Windows applications (using the Linux desktop environment) and not much else.