If you are thinking of using the new GUI (4.6) or replacing your own working GUI with Unity's new system. My advice is:
Reason: There are many many bugs with this on a Windows 8 touch screen PC. And there is nobody in Unity fixing these bugs at the moment as they are all working on Unity 5 I have been informed.
I have been an idiot and put time and effort into making apps with the new UI assuming (after all the Windows 8 competitions on Unity)...
Warning to Windows 8 users.
DON'T!
Reason: There are many many bugs with this on a Windows 8 touch screen PC. And there is nobody in Unity fixing these bugs at the moment as they are all working on Unity 5 I have been informed.
I have been an idiot and put time and effort into making apps with the new UI assuming (after all the Windows 8 competitions on Unity)...
Warning to Windows 8 users.