The Oslo SDK is available for download: Oslo Developer Center
Microsoft also did a good job writing a lot of examples, documentation and tutorials about Oslo, M and MGrammar and the Oslo Repository.
M vs. MGrammar
MGrammar looks quite interesting. As I can see, M is defined using MGrammar while MGrammar itself is self-describing.
M just seems to be a general-purpose modeling DSL. This is where “building textual DSLs” comes in. When you want to define a model you can either define it with M, or create an own more specific DSL using MGrammar. MGrammar will then generate a parser and hopefully a good intellisense-enabled editor.
Screenshots
I’m really to tired to run all of the samples and tutorials and come up with good conclusions. But I got some screenshots 
That’s what “M” looks like. Unfortunately I could not find any examples or screenshots about Quadrant, which should show the same data just graphically.
More than 300 built-in models.
The Intellipad helps writing Models with M or defining textual DSLs with MGrammar.
A part of MGrammar defined in MGrammar
A part of M defined in MGrammar
A textual DSL built with MGrammar
An instance of this DSL
More tomorrow!
It’s 01:42 am here in Germany, and I just want to sleep now
