”Oslo” is the codename for Microsoft’s forthcoming model-driven development platform.
Microsoft is making a big investment in modeling and aims to remove the gap between designing and development.
Currently, people using many modeling tools such as Visio and Rational Rose to create design models and UML models, then developers have to understand and develop these. My understanding is Oslo is to resolve this gap.
In the other words, with Oslo Microsoft significantly simplifies the effort required to design, build, deploy and manage distributed applications. The technology to deliver these capabilities will be delivered through BizTalk Server, System Center, Visual Studio, BizTalk Services and .NET Framework.