Perhaps a bit late, but here are two things I noticed with SL6 alpha3:

* during the graphical boot, I see "Red Hat Enterprise Linux 6" (might have been reported already)
* after updating, I noticed that Nautilus doesn't remember positions/sizes of windows, see this bugreport: https://bugzilla.redhat.com/show_bug.cgi?id=654091

And happy newyear everybody!

Regards,
Patrick

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