If anyone is talking to people about how now SBS 2011 OEM is the only SKU now available and they haven't been able to answer your question.... shame on them! Truly shame on them.
Q: How long will customers be able to purchase Windows Small Business Server 2011 Standard?
A: Windows Small Business Server 2011 Standard will remain available through the OEM channel until December 31, 2013, and will remain available in all other current channels until June 30, 2013. In addition, the Windows Small Business Server 2011 CAL Suite will remain available through the OEM channel until December 31, 2016, and will remain available in all other current channels until June 30, 2016. CALs will no longer be available after those dates.
For SBS 2008 cals you buy SBS 2011 cals and "downgrade them" --- really they go no where you just buy SBS 2011 cals to be legal/official