ghc and the hs-packages now simply include the necessary (haskell)
package description files in lib/ghc/package.conf.d and update the
package.cache by running ghc-pkg recache at the end. register and
unregister scripts are no longer needed.
dependencies have been update "online" (i.e. on hackage.haskell.org)
without releaseing a new version of the package. If this sounds
confusing, just compare the .cabal files contained in the distfiles
with the .cabal file you get from hackage.haskell.org.
