Some even say it will be impossible to install Linux on PC's with UEFI and Secure boot feature. You see, it's up to manufacturers whether they let you switch off/on Secure Boot. In other words: If you can't disable Secure Boot, you can't install Linux. Well, I'm not 100 % sure about that though.
However there is one thing that makes things straightforward. Here it comes: Windows 7 will be around for the next five years. During that time especially enterprises will be buying PC's and installing - Windows 7! IMO most of the manufacturers will leave UEFI open so that it's possible to switch Secure Boot off. Windows 7 will operate just fine if the good old BIOS is there. In case of Secure Boot switch it off and install Windows 7.
You do want to run Ubuntu on an x86-tablet, dont' you?