I think your talking about two themes, right?
Have a look at the previous announcement about the upgrades. We're just wanting to go with a more visually and spacially appealing layout. No big razzel dazzel features that only work on bleeding edge browsers.
http://www.amiga.org/forums/showthread.php?t=45170- Improved compatibility with older browsers
The Javascript used natively by Xoops (which, sorry, we can't get rid of) has also been improved and in testing with Amiga browsers, actually seems much more compatible than the Xoops 1.3 Javascript.
