Microsoft has just announced Office 365 as the new name of BPOS.
This new product encompasses not just the new versions of the 2010 range of online Office Server products (ie. Exchange Server 2010, SharePoint Server 2010 and Lync Server 2010) but also the inclusion of Office Professional Plus 2010 as well as Office Web Apps.
The official press release: http://www.microsoft.com/Presspass/press/2010/oct10/10-19Office365.mspx
The official site: http://office365.microsoft.com/en-US/online-services.aspx