Since 12.04 is just around the corner, and the two main applications IMO right now are the USC and U1. Due to that, is there any plan to port them completely into Kubuntu, Xubuntu and Lubuntu (also Ubuntu Studio.. but i think it's already there..)?
I think it will add the much-needed Ubuntu touch to those derivatives, so that they'll have their own personality.
There's a Lubuntu Software center available:
Kubuntu uses the Muon Suite as it's software center
Xubuntu does have the Software Center aswell.
(This is probably not the latest Xubuntu, but as you can see it runs the Software center too).