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

-- 
All views, opinions and
alleged facts expressed by this tactless
moron should be taken as good
natured and friendly unless
specifically stated otherwise.