This happens around freezes of testing, because it is preferred to be able to run updates to testing through unstable, which means that core packages can't be upgraded during that period, or this would greatly complicate releasing.
Posted Jul 16, 2012 22:54 UTC (Mon) by drag (subscriber, #31333)
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Well when you have a Fedora release it will generally be out ahead of Debian unstable for a while. After a couple months it would catch up, but then eventually Fedora has another release.
I use Debian Unstable and Fedora on my desktops.To me they seem roughly equivalent in terms of 'rawness' and goals even though they take different approaches.
To find a equivelant for Rawhide you'd have to look at mixing Debian Unstable with Experimental.