Bits of KDE4 can be installed in KDE 3.5.x. Screenshots here:
http://wolfnix.net/tmp/k4/index.html
Related:
KDE 4.0 Beta 2 Release Announcement
,----[ Quote ]
| With the second beta, the KDE community focuses on stabilizing its codebase.
`----
http://kde.org/announcements/announce-4.0-beta2.php
KDE 4.0 Beta 2 release with Screenshot Nirvana!
,----[ Quote ]
| Many of you know, KDE 4.0 was slated for release in late October but, I’ve
| been told today that the date may be bumped - I’ve been assured though that
| we will definitely be good to go so Santa can put an bright and new KDE 4.0
| under your Christmas Tree (or whatever you want to put it under).
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http://rackit.gartnerwebdev.com/2007/09/06/kde-40-beta-2-release-with-screenshot-nirvana/
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