Last year, I attended a nice free one-day seminar on developing applications for Windows 8.
Bottom lime: Microsoft really, really wants developers to develop Win8 Apps.
One concern I had was that corporations or other enterprises had an extremely difficult time writing these apps – and then NOT publishing them on the public-facing Windows App store.
This seems to be a great workaround. I do not know why Microsoft failed to cater to their existing corporate customer base at the launch of Windows 8.