Well, last week a preview of the ability to do this was released by Microsoft.
I've not seen much publicity of this but know many people will be interested so I'm trying to help spread the word.
If you're interested, it's the same code that powered the Bing client on Windows Phone, Bing Translator app, OneNote and OneDrive.
You can find the documentation (and sample) on MSDN http://msdn.microsoft.com/en-us/library/windows/apps/xaml/windowspreview.media.ocr.aspx and the NuGet package at http://www.nuget.org/packages/Microsoft.Windows.Ocr/
Are you a Windows Phone, Nokia-X (Android) or Asha developer? If so, you could be getting rewards for the apps you build and the success they achieve by joining the DVLUP program.