As with SBS 2008 we are still not able to download the full SBS 2011 DVD (weighs in at 6.5GB) via the Microsoft Volume Licensing Service Web site.
We will, however, be able to download the SBS Premium Add-On 2011.
Note that there are two options under Operating System Type: 64 bit and 32/64 bit.
Note that the combined total for the downloads is close to 7GB.
The SBS 2011 RTM bits are available to MAPS subscribers via the TechNet site.
Though, after checking in with our non-MAPS account it looks as though the bits are available for all TechNet accounts now:
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book