1. Dunno. Apparently she can be seen in the trailer, which shows a close-up movie of the carnival. It's not in the full game (or if it is, I've never found it!)
2. Dunno. LucasArts removed it. Those skanks. Hopefully when Mojo *finally* gets settled down, someone will offer it for download.
3. Part of Year One - from where you first discover the Lost Souls' Alliance, until you manage to get the eggs from the pigeons. Not much really, but it lets you look around a bit.
4. Dunno what those are. Helpful aren't I?