Most of these releases are going to make a big leap to Linux Kernel 2.6.27.x and Xorg 1.5.x, and apps such as OpenOffice 3.0.x, Firefox 3.x.x, and many things.
I have tested betas of DreamLinux 3.5, PCLinuxOS 2009 and Mepis 8. While PCLinuxOS is making a steady move as before, Mepis is making drastic moves forward. But the best thing is none are moving to KDE 4.x.x. That means both are standing tall as the leading desktop oriented distros. Fedora, OpenSuSe and Mandriva have plunged into KDE4 with some obvious tradeoff in usability and features.