It is an interesting move from Microsoft to open the gates for supporting Linux subsystem. But a lot depends upon how the integration happens and to what extent the userland applications can make use of the support. Adding a abstraction layer and a kernel module does sound a serious effort in terms of providing the API support. But it would be interesting to find how the entire system stacks up for delivering a server grade performance, one of the reasons for trusting on Linux.
http://arstechnica.com/information-technology/2016/03/ubuntus-bash-and-linux-command-line-coming-to-windows-10/
http://arstechnica.com/information-technology/2016/03/ubuntus-bash-and-linux-command-line-coming-to-windows-10/