I think NucleusKore can help you design "Service Packs"
He is the offline package expert here.
Perhaps you could roll out monthly ISOs containing updates as an AptOnCD.
And yes, I hope you did NOT forget to include AptOnCD in your distro.
And AptOnCD ISOs of different package sets would be neat.
For example, you could release an AptOnCD package containing KDE stuff if the user wishes to use KDE. You could release an AptOnCD package containing ubuntu-studio packages too. These would enable people without internet connection to get a set of features on their distro.
This feature is NOT there in ANY newbie distro at the moment, so this is going to be another success point in your distro.
Tell me when the distro is bug fixed, and I can personally design this part for you.