The Gentoo KDE Team decided not to include KDE 4.5.0 in the main portage tree, due to the lack of the KDEPIM suite, which would cause a lot of trouble to users trying to upgrade. Thus, it will remain in the kde overlay hardmasked. It can be installed with KDEPIM 4.4.5 though, if the user adjusts the keyword files accordingly. The first KDE 4.5.X version that will include the KDEPIM suite will be added to portage as well.
Furthermore, we decided to keep a bit more the live ebuilds of the 4.4 branch, and not to provide any snapshots yet. The Gentoo KDE Guide has been updated to adjust those decisions.
EDIT: Also take a look at comment 10, which has a better explanation
EDIT 2: For news regarding KDE 4.5 in Gentoo, please read http://blog.tampakrap.gr/gentoo-kde-and-qt-september-meetings/
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