There's quite a bit of music in KOTCS from the warehouse, rocketsled, doomtown, jungle chase and other bits that are not just retreads of the Raiders March.
And no, the set was not annouced prior to the KOTCS CD release. Like I said, the TOD and the LC music on the bonus disc make it worth it, but they should be sold separate like the extended ROTLA was in the event that you own KOTCS already. Also I stated I'd be perfectly happy to buy it and get credit so I could download extra KOTCS from the internet (that would let the record label save face and still be fair). If I'm willing/forced to pay again for something I already have then they can be nice and throw a frickin' bone.
As far as getting the music from the pre-vis on the DVD, no. #1 I shouldn't have to do that if I am paying for an extended box set for soundtracks I have already have, and #2 that music in cut up and not comprehensive. There are many parts whey they trimmed and cut music to match the pre-vis since the previs was faster than the actual scenes.
EDIT:
Riddle me this Batman...now that this box set includes all of the films music, why then do we have the Raiders March with Marion's theme included on track 1 if we're getting the ROTLA disc and a bonus disc with it too? That track was included on KOTCS for those who don't own the other Indy CD's. Now it's just a waste of space and could have 5:00 minutes for other KOTCS music. This is just a cash grab. For those who don't own KOTCS is a nice bonus, but lets be real, anyone looking to buy the Indy box set likely has it already.