Should we try to print a short summary of the commit that was just created, similar to what C Git does?

  $ git commit
  [pack-bugs 374c280] Don't insert the same pack twice into a pack list
   1 files changed, 13 insertions(+), 0 deletions(-)

Maybe we skip the status line right now, but print that first line listing the branch, commit SHA-1, and subject line.