Will we have a GNOME version of Ubuntu available for download like Kubuntu is for KDE and Xubuntu is for Xfce. Maybe something like 'Gubuntu' for GNOME
"GNOME version of Ubuntu" is not a good definition, since the default Unity variant will also be using GNOME extensively (but not GNOME Shell). Unity and GNOME are not mutually exclusive.
If you mean a non-Unity GNOME version, it won't be "available for download", but on the CD and installed by default, since it will be the fallback for systems that can't run Unity.
There is currently an unofficial community-led GNOME Shell remix of Ubuntu under development called Gnomebuntu, which aims to become an officially-recognized variant later on. You can follow developments on the project here. (There is an official website for it, but as of this writing all it has is a nice-looking placeholder.)