1. What darcs version are you using? (Try: darcs --exact-version)

2.9.1 (+ 47 patches)

2. What operating system are you running?

Linux x86_64

3. What were you doing? (eg. what darcs commands)

$ mkdir foodir
$ darcs add foodir
$ darcs wh
adddir ./foodir

$ rmdir foodir
$ darcs wh
No changes!

$ darcs rev
There are no changes to revert!
Finished reverting.

$ cat _darcs/patches/pending
adddir ./foodir

$ darcs remove foodir

$ cat _darcs/patches/pending
{
}

4. What behaviour were you expecting?

That whatsnew would notice that I've got an adddir in pending, but have
removed the dir in working. (Similarly for revert)

5. What went wrong?

Darcs kept the adddir in pending, until I explicitly removed it with
`darcs remove`.

Sounds similar to this:
http://bugs.darcs.net/issue1325