Linux 3.0 is now released for Gentoo users in both vanilla and gentoo-source versions. These two ebuilds should be hitting the mirrors in the next few hours.
Currently, deblob support is not available due to the kernel tarball being named 3.0 and the deblob script being 3.0.0. The eclass needs to be looked at to see how to handle this. It would be helpful if everything was named either 3.0 or 3.0.0. A mix makes things a bit more challenging.