If you had your eyes open for the first few seconds of the video, you can see what appears to be a hl2 style background map. Well if you guessed that then you are correct! Xash allows for map backgrounds for the menu. While it isn't chapter specific like hl2, the feature is very much appreciated, and we plan on taking full advantage of it in the mod.Also, I don't think such a feature could be easily added to Goldsource (without access to engine source code).