There's a few new scenes, and actually a few of your scenes it looks like. A lot of the art seems to be higher res and cleaned up a bit. The quests, dialogue, and progression for Lisa, Sarah, Sydney, Kimberly, Mrs. Amos, and Dizzy all seem to be overhauled. It looks like Kaylee isn't included in all the new stuff, and while Mom has scenes, it doesn't look like she has her dialogue and other stuff finished. There's a few new maps and locations too.
You can download it and pull the content from here without having to play.
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I could pull some of the stuff for you directly if you need.