From Fedora Project Wiki
GHC has been updated to version 7.6.3 and Haskell Platform to 2013.2.
Many packages have been updated and new packages added include idris and various libraries.
All packages have been updated to follow the new simplified revised Haskell Packaging Guidelines.
Note that ghc-7.6 does not officially support llvm-3.3 so there are some issues when using the llvm backend (particularly on ARM where it is the default).