There is my xda thread: http://forum.xda-developers.com/showthr ... p=36967050
I have modified CyanogenMod's "Trebuchet" Launcher(s) to enable the rotation.
So Here is CyanogenMod 10.1 Trebuchet launcher with rotation (Android 4.2.x):
Notice that I am using Motorola Mod so that's why the softkeys is in some point invisible....
Also CM10.1 Trebuchet launcher is using ?"Zoom In"? transition.
http://ge.tt/10kIlxV/v/0 Download Trebuchet launcher for Jelly Bean 4.2.x
CyanogenMod 10 (Android 4.1.x) Trebuchet launcher with rotation:
Tested by KushET (in XDA forum) and picture is by him too (Jelly Bean 4.1.1)
http://ge.tt/1tVzoxV <Download Trebuchet launcher for Jelly Bean 4.1.x
How To Install:
Install as normal app or move it to /system/app/ and change permissions to "rw- r-- r--"
That's it!

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Wait: I wan't to use stock Jelly Bean 4.2.1 launcher with rotation:
Here: http://forum.xda-developers.com/showthread.php?t=2020333