[jdp]

One thing that isn't clear at all is if it is necessary to use Visual Studio to build a WinJS app. Can I develop and test the app on a MacBook or Linux laptop in a web browser, and only involve Visual Studio when I need to package the app for the store? Or is VS required to even get started?

[dlannoye]

They have a project file for Sublime Text 3 and are using grunt as a build system so you should be able to use it on a Mac or in Linux. However from their road map it looks like they are still trying to fix a lot things that only work in IE.