User blog comment:Yanxa/Extended Cut DLC - what we'd hoped for? *NO SPOILERS, PLEASE*/@comment-355183-20120704180516

It gives additional information, basically patching up plot holes. And a bit of information about what happens afterwards. Well, most people are content with that, so that's that.

To the last question there: No. But you do get to see something like two extra scenes that show the Alliance navy.