I can see the appeal of a new version if in surveyor we can work with multiple route layers so that one could imitate more common styles of layouts with lower staging and upper running (or in some cases multiple layers of running and a layer of staging) but other than that I really dont see any difference between this and any other version of trainz
I'm not sure if N3V are doing a version on disc, probably not, but it's easy enough to download the online version to a CD/DVD and keep that as a backup version.