Is this the update that mysteriously downloaded when I started up Steam tonight? It downloaded something for Skyrim, but of course, being the useless pile of carp that it is, the Steam Updater tells you nothing useful about what it is doing. And a search for recent "News" or "Updates" on Skyrim reveals nothing new either... (Well I guess it isn't the 1.5 update since the file version of Skyrim is showing ver 1.4.27 but I really shouldn't have to look in my SteamApps directory to know whether my game has been updated.)
Tell me again, why did we need Steam? What magical benefits does it confer to offset the annoyances of using it,
if it can't even tell you why it is updating your game? 
On the other hand, Nexus does have info about the beta release. Hmm, well I would add that maybe a useful update for 1.5 or in the future is to add some kind of info box into the Skyrim Launcher that tells you what file version you are on.