If you haven’t been keeping up on the ADO.NET team blog, but you want to get up to speed with what’s coming in the next release of the Entity Framework (.NET 4.0), then now is the time to start monitoring their blog.  Since 5/11, they’ve cranked out seven posts on new features.  I like what they are doing.  The post on 5/11 gives you a high level update.  Then, they have followed it up with “Sneak Previews” of specific improvements.  Definitely worth the time to read through these posts!