I found an interested thing at right now when I try to download the update app 10.9.1 from 10.9 via the link given by tonymacx86(thread is OS X 10.9.1 Update,
http://www.tonymacx86.com/400-os-x-10-9-1-update/comments7.html#comments) I click the link
Download the OS X 10.9.1 Update(
http://support.apple.com/kb/DL1707),the page show me the update is for the late 2013 mac pro now.
the update date is show
Post Date: Dec 19, 2013 File Size: 203.1 MB, It is different from the file posted on Dec 16,2013,file size is
243.4 MB(chinese language vision page).So far,only the english update page show the new change,but other language pages are still show the old app download link.
I don't know how much different between the two update app,but I will test each one,maybe I will try to rebuild the OS twice.if I found some can be report,I will post here.
at right now,I will try to install the new app,test it,maybe try another in 2 or 3 days.
happy merry Christmas!