@warmer
For the caves it can probably go either way. The negative possibility comes from the
removal of Libnoise "totally blanked now" This was probably what would have been used
to generate cave system, or digger addon which has not be added. the only other way is
prefabbed caves compiled by the artists, there are 5 presently.
On the other side "positive possibilities" comes from the following video interview. Joel
although not very verbose, talked about going toward conclusion, looking at older, systems
and routines, as long as they fit in with their final vision.
https://www.youtube.com/watch?v=HyJHGXW3uUM
If you go back and look at each alpha, many people have posted that the game seemed to be
different or changed per alpha. I just think of them and primers or testbeds, for what can
be (in and ex cluded) from the final release.
Some of the things may have been dropped initially, but may see the light of day again
depending on the final idea.
The video is interesting, and fills in a lot of the whys and what fors questions, that people
have posted.