Is there any possibility to get the new unity launcher while having the Gnome classic desktop?
I enabled the classic desktop as described: How to revert to GNOME Classic Desktop?
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By issuing the command
unity-2d-shell, you will launch the launcher.
Here is what you have to do, to automatically do this on startup:
Add Startup Program
For autohiding the launcher in 12.04 see this question: Autohide Unity Launcher in Gnome Classic.