Other than from 10,000ft. and a familiarity with O/RM tools (EF does that but a whole lot more), EF is close to an unknown for me. This will be a good challenge to teach myself the technology and then effectively convey that understanding to the folks attending the presentation. However, EF looks like an excellent opportunity to accomplish a common LOB task more productively -- something I'm uber-passionate about -- so I don't think it will be an issue. I'm also delivering the talk internally in February for practice and may pitch it to a code camp if things turn out well.
Best articles I've found so far:
ADO.NET Entity Framework Overview
Introducing ADO.NET Entity Framework
ADO.NET Entity Framework (yes, Wikipedia...hey, it's straightforward)
Microsoft’s Data Access Strategy