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/usr/share/doc/samba-common/Roadmap is in samba-common 2:3.6.6-6+deb7u7.

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The actual contents of the file can be viewed below.

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Copyright (C) 1997-2008 Samba-Team

The Samba-Team are committed to an aggressive program to deliver quality
controlled software to a well defined roadmap.

Please also look at the Samba3 and Samba4 pages of wiki.samba.org for more
information.

The following development objectives for future releases
are in progress:
----------------------------------------------------------------------------
Samba-3.0.x		This release turned into maintenance mode since we
			released 3.2.

Samba-3.4.x		This is the current stable Samba 3 release intended
			for all Samba production server.

Samba-4			Danger Will Robinson, a big code clean up with major
			system redesign. More will be announced as this work
			starts to take shape.


Note that it is a given that the Samba-Team will continue to track
Windows (NT/200x) update releases, ensuring that Samba will work
well with whatever "Beta" releases Redmond throws our way :-).

You may also note that the release numbers get fuzzier the
further into the future the objectives get. This is intentional
as we cannot commit to exact timeframes.