The bonus map is just high quality paper, that's pretty much it.
What is CE SG? CE Strategy Guide? Confused.
http://www.amazon.com/gp/product/0307891402/ref=oh_o00_s00_i00_details
-Large map Poster inside-
Labeled with important locations, major roads, and hold capitals
and a pic of it
http://cdnstatic.gamesas.com/bethblog.com/wp-content/uploads/2011/11/photo.jpg
The map does come with both versions of the guide. No idea of the size though, sorry.