A couple of days ago Philips updated their Hue app for iOS 8 compatibility. Sadly they didn’t add the previewed Notification Center extension (yet?), but they did change their URL-scheme identifier so I couldn’t launch the Hue app via the now depricated Launcher app anymore.
I reached out to them through Twitter and apparantly they now use phiosappl:// as the identifier.
@tverschoren There is a new app callback scheme phiosappl
— Philips Hue Dev (@philipshuedev) October 9, 2014