Lots of people are stockpiling SBS after the announcement. Lots of people getting with Software Assurance as they'll get free upgrade to Server 2012 and Exchange 2010 (More than double the value of SBS Standard). Microsoft has strategically made that last only until the end of the month. OEM Copies will be available until the end of next year which is what most of us bought.
I think it will last a while. There really wasn't much room for improvement with SBS Standard. It works, and it works well. I know a lot of people that were still buying server 2003 well after server 2008 came out. The new versions don't offer much new functionality compared to the old one.
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