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Debian GNU/Linux 7.0 (Wheezy)
Debian seems like the epitome of the 'We will make no release before its time' distributions — the exact opposite of the Ubuntu 'new release every six months, come hell or high water' philosophy. The Release Candidate for the Debian 7.0 installer is currently available, which means it won't be too long until the final release. My personal opinion is that the development of Wheezy has been a bit smoother than the previous couple of releases, but that may only be due to the fact that I wasn't paying all that much attention as it went along.
Ubuntu 13.04 Raring Ringtail
Ubuntu. My, how perceptions have changed over the past couple of years. In my opinion it is now such a polarizing release — almost everyone I know has very strong feelings about it, one way or the other. Some are convinced that it will be the saviour of the Linux world, and some feel just as strongly that it's the worst thing happening to Linux today. But I don't know many who just say "Whatever. It's ok, I'm not bothered either way." The next release of Ubuntu — 13.04, known as Raring Ringtail — is due out on 25 April. The Beta release is due next week (14 March), but of course Daily Builds are available for those who are very anxious, very curious and/or very brave.
I think of Korora as being derived from Fedora in much the same way that Linux Mint is derived from Ubuntu. They start from a very good distribution, and then they add all the things that I would put in myself, and they end up with a great distribution. The Beta release is currently available, but as far as I know no final release date has been set yet. At the same time, there has been a name change (dropping the second "a" from Kororaa) and a web page change (to www.kororaproject.com), so make sure you look in the right place for this one.