Microsoft has announced at Build 2015 that their new tools will allow developers to compile the Objective-C code for their iOS apps to work on Windows 10.
The new toolkit in Visual Studio will allow devs to build Windows Store-ready apps from Objective-C iOS code, and will support the touch controls and keyboard and mouse. The tools also allow for integration for Xbox Live, as well as other Microsoft services and features. This technology is already be demoed with Candy Crush for Windows Phone.
For more from Build 2015, keep it locked to our Keynote Live Blog.