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GNOME 3.x Will Bring Back Some GNOME 2 Features
Going forward it will be easier to enable the GNOME Shell to exhibit old GNOME 2.x functionality like the classic alt-tab, a task bar. minimize/maximize buttons, a main menu on a panel, etc. This isn't being done by abandoning the GNOME Shell and the GNOME3 philosophies but rather taking advantage of the extensions framework. There's already GNOME Shell extensions to provide much of this functionality, but they're not packaged in an easy-to-use manner and widely advertised to users.
The new plan is for GNOME to package up these common extensions for providing a GNOME2-like experience and treating them as a GNOME module that will be tested against new releases too. From there it will be easy for end-users to enable a configuration option or similar setting for bringing back these old GNOME 2.x traits that are desired by a measurable portion of the Linux desktop user-base.
The GNOME developers also aren't doing anything to make GNOME Shell more twekable since their view is that "there should be a single, well-defined UX for GNOME 3, and extensions provide a great mechanism to allow tweaks without giving up on this vision." The GNOME developers also have no plans to endorse the Cinnamon fork.
More information on this GNOME "classic" experience comeback are outlined in this mailing list post from today. While waiting for more GNOME 3.8 code to emerge, be sure to participate in the 2012 GNOME User Survey.