Just a note that I decided to install Compact 2013 on my laptop for travelling.
I already had Compact 7 installed, but was reluctant to install 2013 because of side by side CTP issues.
Its a Win 8 machine
I know there were problems with doing this with the CTP, it wrecked the Compact 7 setup.
It is now started that side by side installation is supported, assuming Compact 7 must be in place first.
I just built a new Compact 2013 image and followed up with building an existing Compact 7 OS successfully, all on the same system