"Like most major distros, it's not that often that we see a new
release from the Gentoo team. In fact, it's twice a year, which is
still more often than few others. The difference with Gentoo
though, is that the new releases are not always awaiting much
anticipation, since the bulk of the updates can be had through the
system updater, Portage. If you keep your system up to date, you
already have 2007.0. This article will be primarily written for
those already familiar with Gentoo, but if you are a new user
wanting to know what it's all about, you can read my 'Why Gentoo'
section from a previous article.
"If you are a user of a previous version of Gentoo, you could
switch over to begin using the 2007.0 profile. To do this you can
run eselect profile list and then select the new profile with
eselect profile set default-linux/x86/2007.0/desktop..."