If you need to update (changes on the central repository), then you pull (git pull) and you see the new available versions (only with gitfiletree). FileTree will only show you the top version of each package.
This is an area where I prefer to use `git diff` and enter the territory of "git integration"... it is possible to use git to compare two different SHA's for a given package/project/class/method and it is possible to compare the in-image package/project/class/method with a particular.
In my opinion, this is the area where one should break from the Monticello paradigm where the package is the sole versioned entity and expand the versioned universe to include project/package/class/method versions. There is also tremendous value to simply comparing two different git commits which may span multiple packages and include updates to documentation and other text files ...
To view git through only the package model is too restrictive and limits some of the real power one can experience when using git ...