Mandriva 2011 Beta 1 is packing KDE SC 4.6.1, systemd 20, an updated NetworkManager and Bash, Firefox 4.0 RC1, the plasma-applet-stackfolder application, and various other changes. It's talked about on the Mandriva Blog.
On the Mageia side they have released Mageia 1 Alpha 2, under the Primeavera codename, in this blog post. Mageia 1 Alpha 2 has over 6,100 source RPMs in its repository and now features full support for LibreOffice, KDE SC 4.6.1, RPM 4.8.1, and various other package updates. There's also the release notes for those interested.