We are now moving forward by defining a few release goals for Lenny, which are of interest for the release team and all involved maintainers and packages.
Hi Debian fellows
The Tcl/Tk team announced in October  that some work is happening
off-stage about Tcl/Tk versions and their reverse dependencies. A new
policy document is currently available  whose aim is introducing some
order and improvements in the current Tcl/Tk status. We are now moving
forward by defining a few release goals for Lenny, which are of interest
for the release team and all involved maintainers and packages.
Our goals in descending order of priority are:
[A] Removing /usr/lib in $auto_path . That has been already announced
in the past message with motivations for that, and experimental packages
are available in experimental for testing. We are going to release a
non-/usr/lib Tcl/Tk in unstable and preparing a few NMUs for packages
which need fixed pkgIndex.tcl for that. That will happen as soon as
possible. A dedicated page about tasks and packages involved in the
transition is  for all interested parties.
[B] Removing Tcl/Tk 8.3, which is largely obsolete since years, and not
supported upstream. That will make security teams happy. A few packages
need to depend on Tcl/Tk 8.4 and testing, a few main extensions will
need changes as well and all that will/could propagate to other
packages. A dedicated wiki page listing the packages involved in 8.3
removing is available . Some packages could need specific patches in
order to work with a current version of Tcl/Tk, but that should be not
the general case. If a patch cannot be provided (dead upstream, none is
able to provide a suitable patch, etc) the interested package will be
proposed for removal because obsolete. That is surely the case of some
[C] Making the recently released Tcl/Tk 8.5 the default package in
Lenny. Default packages are a recent concept introduced in the last
months in order to improve the status of the Tcl/Tk dependencies
building by allowing bin-NMUs when ever needed. We would have the long
waited 8.5 as default package in the next release.
– Francesco Lovergine (in behalf of the Tcl/Tk team)