July 6, 2015
Update 19th August 2015: Apple have released Bootcamp 6, which fixes all of the below when using Windows 10. If you already have Bootcamp 5 installed, run the Apple Software Update utility to get the latest set of drivers. The only oddity I’ve had with Bootcamp 6 is that is resets your DPI scaling to 200%.
Windows 10 on Bootcamp (Macbook Pro 13 inch, Bootcamp 5.1) has some teething issues as of build 10162.