[As an aside to the main point in this post: One of the great things Microsoft does is put new buzzwords and buzz phrases into mainstream use.You'll remember 'Space' (as in 'the developer space'), surface (as in 'the design surface') and experience (as in 'user experience' and UX). Yep, you take them for granted now right? The latest one I've been hearing a lot of is 'technical investment'. Steve Martin's post on Oslo is an example.]
From Steve's post on Oslo:
Oslo is the codename for a set of technical investments that will be delivered through the next versions of our application platform products such as Visual Studio, System Center, BizTalk Server, BizTalk Services, and .NET Framework. Oslo will take model driven design mainstream.
Mary Jo also notes Oslo.