KotF is being released in two parts. The first part has some new effects, the menu systems, and 3 missions. The three missions are pretty good, albeit simple, are playable from two sides, and are pretty difficult. Part 2, which should come out this month (i think, don't remember) will have the same features but contains 31 missions, playable from both sides.
With the menus you essentially create your own adventure by choosing your character and any amount of JO/JA/new NPCs, your weapons, the map, which side you fight for, etc. You can also play the JA storyline with any of the characters and switching at any time. It's interesting as Jabba the Hutt
It's pretty fun. I've recreated the assault on the Tantiv IV playing as every character I can think of, and people post their save games on the forum, so you can play just about every jedi battle that there has ever been already. It's a rather large download though, but you can always uninstall it if you don't like it.
It took a while for you to find me; I was hiding in the lime tree.