And adjacently: is there an intention to organize this site in different subcategories for the different members/desktop environments of the Ubuntu family?
Ask Ubuntu gives support for any of the Ubuntu family releases, not only Unity or GNOME. Questions regarding Lubuntu, Xubuntu and Kubuntu are more than welcome and there are plenty out there already.
There is no intent to split the site to cover these releases separately, only that most users will be using the default Unity release. Tags are used to separate the different DEs, ie: kde, kubuntu, xfce xubuntu.
Please read the FAQ for more information on what belongs or not in Ask Ubuntu.