Trust me, you want to upgrade. Windows 8.1 is to Windows 8 as Office 2010 is to Office 2007.
Bad analogy to anyone who thought Office 2007 was really good (which would be most who upgraded from Office 2003 and went through the 1+ year learning curve).
Thanks, Techcrunch. I just set a cron job on my gentoo box to emerge world at 4PM PDT, to honor Microsoft's Windows 8 bugfix.