At first boot, the system is expanding to the whole sd-card. The problem is: If one wants to clone the card (e.g. with additional software) this can cause a problem, because the SD-cards do not have always the same size (8GB != 8GB). And I do not know if a shrinking of the memory is a clean solution.
Hmm, this should not happen. Do apt-get update and try again … maybe you did when repository was not yet populated to all servers. This can happen.
This suppose to be a feature not a bug If you want to create an image with additional software, take a look at my build script. It was designed for such scenarios.
https://github.com/igorpecovnik/lib