The ADO.NET Entity Framework is very strategic to Microsoft - but a) it is a V1.0 technology (although we have been dabbling for some time - remember ObjectSpaces in 2004) and b) it hasn't actually shipped yet.
BUT... the good news is V1.0 is pretty much done which has allowed V2.0 development to start at the end of June.
The team are intending to be very open about the design decisions they will be making. They have created a new blog and the first post covered their intention to be transparent. It also serves as a great indicator of what is missing in v1.0 (NB: v1.0 has lots of stuff in it).
V2.0 may (hopefully) include:
They followed it up with a short paper and screencast on POCO.