Well it is a bit of old news but that has never stopped me before.  Microsoft recently announced Microsoft Centro (Centro is the codename of the product), SBS's big brother and is aimed at businesses with 25 to 250 PCs.  Like its little brother SBS (the next version anyway) it will include Exchange 2007 and thus be 64-bit only.  It is based on Longhorn and includes some new security features as well.  This should be a pretty cool product to help meet the needs of large-small to midsize companies.  From what I have seen Centro requires the use of three seperate 64-bit capable servers.

There is a little Q&A about Centro here.

More information about Centro and instructions about how to get on the beta here.

If you are interested in joining the "Centro" Beta please go to http://connect.microsoft.com click on Invitations sign in with your Windows Live ID (Passport ID) and enter the following invite ID; Extr-GHBC-JCJM. You will be asked to take a short Survey. Once you complete the survey look for an email from MsftConn@microsoft.com. If you don't already trust this address, please add it to your trusted email addresses.