Adam Barratt and the release team sent out an update on the status of transitions, Release Critical bugs and a Timeline of the Squeeze freeze. In short, we have a way to go before Squeeze is frozen and it is difficult for the release team to estimate when Squeeze will get frozen. Adam writes In order to help us keep a clearer picture of which changes still need to occur before we can freeze, we will be introducing a 'transition freeze' before the end of this month. If you have not yet discussed your transition with the Release Team, please ensure that you have done so before May 21st."
The release team is already working on some transitions now, like Qt4 and gnome-desktop, which are finished. The KDE team is working on KDE 4.4 with the goal of having as up-to-date and stable version of the KDE suite as is possible. To quote Adam: We're also close to completing the evince / totem-pl-parser transition, which means we're well on the way to have GNOME 2.30 in Squeeze.
Release-critical bugs statistics for the upcoming release
According to the unofficial RC-bugs count, the upcoming release, Debian 6.0 Squeeze, is currently affected by 370 release critical bugs. 72 of them have already been fixed in Debian's unstable branch. Of the remaining 298 release critical bugs, 37 already have a patch (which might need testing) and 20 are marked as pending.