Would anyone be able to give insight on why this would be useful? Im curious, sure, but I'm at a loss to think of a use case.
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OSX is better because it doesn't feel too different from Linux (aside from setting docker machine ENV variables). Still virtualized so you take a performance hit.
I wonder how they will make Ubuntu happen on Windows. Reading some of the comments, some speculate a subsystem, while others suggest an interoperable interface.
Edit: reading bitcrazed's comments it looks like it will be implemented a la WINE. No need to recompile binaries made for Linux x86; you'll be able to run apt packages from Ubuntu out of the box.