This is more like a suggestion than an issue.

I would like to see an ability to build Windows Runtime components that can be used from any supported language and that can use existing iOS libraries.

I'm a C# developer, and the company I work for uses Flurry Analytics in mobile apps. I'm building mobile apps for Windows and Windows Phone, and recently I learned that Flurry doesn't support Windows Runtime SDK anymore. This issue could be easily solved with Windows iOS Bridge by just using Flurry's iOS SDK and wrapping it up in a Windows Runtime component.

I believe there are many other examples of such an application for iOS Bridge.

Windows Runtime components are discussed in issue #20