From Mahara Wiki
This is a beta release of Mahara 1.1 Sonorus. Things will be broken! However, we are now soliciting bug reports, should you find a bug. You can report bugs to the tracker:
Please choose 'HEAD/trunk' as the version of your bug.
This release is the first release in which upgrading from the 1.0 stable version is possible. This does not mean that this should be done on a live website! Furthermore, upgrading from this release to any future release will not be supported either, so please perform any testing you might want to make on either a new install of this release or a copy of your 1.0 site.
This release includes:
- An upgrade path from 1.0 to this release
- Minor performance improvements (less queries per page, less files included)
As mentioned above, the upgrade should not be attempted on a live site yet. Instead, make a copy of your database and dataroot, set up a new Mahara using them, and test upgrading on that.
Also as mentioned above, upgrading from this release will not be supported.