There are updates available to those with maintenance agreements - see the posts by David Evans in the very long thread entitled "When will come new version of Ghost". This includes a new boot disk environment using a current version of WinPE.
If you don't have maintenance then you can also update your existing Ghost environment yourself using the details in this old posting: https://www-secure.symantec.com/connect/articles/creating-and-using-winpe31-image-gss-251. Terry Bu has also written another article to follow on from this but I can't find the link at the moment.
There are other articles regarding UEFI and Windows 8 which you may want to hunt up, but essentially the next version of Ghost is coming along and should solve all your issues at a stroke.