If you are an Ubuntu user and you wish to test the very latest development code, Stellarium now provides a Daily Builds PPA:
The packages are built directly from the latest version of the development code. They are updated once per day or less often, if there are no changes to the code.
WARNING! These packages are UNSTABLE! Use them at your own risk. At the very least, don't use them if you don't know how to downgrade Stellarium's package to a previous version.