I downloaded and tested the 3rd beta release of Mepis 11. The live DVD is about 1.3 GB.
To my untrained eye, it looks very similar to Beta 2, although I did notice the following changes:
1. The bootup options are less.
2. LibreOffice is included as the main office suite now.
3. KDE compositing is deactivated by default.
It ran exactly as Beta 2 did in my computer...I guess I'll check it out in an older computer later.