At WPC, Microsoft disclosed TWO, public preview releases for the next version of SBS includes:
Windows Small Business Server (SBS) "7" Preview will include a richer remote access experience, as well as updates to all of component software in the suite to latest versions (Windows Server 2008 R2, Exchange Server 2010 SP1, SharePoint 2010 Foundation, Windows Server Update Services 3.0 and SQL Server 2008 R2). As a result, small business customers will find significant security & management enhancements as well as much richer features for providing file-and-print, email and Internet services to employees. SBS 7 will support up to 75 users.
Windows Small Business Server (SBS) Code Name "Aurora" Preview will let customers be able to better protect their business data through automated backup and restore capabilities, easily organize and access business information from almost anywhere and run a variety of business tools and software. SBS Aurora will support up to 25 users.
Also, announced Windows Server Solution Software Development Kit (SDK), which'll enable developers to build add-ins and write drive integration of new and existing on-line services with SBS Aurora.