Clarification on Global Backports Policy

I just want a little understanding about the backports policy. The policy I have read is here https://wiki.mageia.org/en/Backports_policy and it is clear regarding singular packages.
How does this policy apply to more global packages such as KDE, gnome, XFCE? For instance if KDE 4.9 is released 3 months in to this new Mageia release how and when would it become available in Mageia 2?
How does this policy apply to more global packages such as KDE, gnome, XFCE? For instance if KDE 4.9 is released 3 months in to this new Mageia release how and when would it become available in Mageia 2?