checkout --track origin/hack" used to be a syntax error.  It now
  DWIMs to create a corresponding local branch "hack", i.e. acts as if you
  said "git checkout --track -b hack origin/hack".

* "git checkout --ours/--theirs" can be used to check out one side of a
  conflicting merge during conflict resolution.

* "git checkout -m" can be used to recreate the initial conflicted state
  during conflict resolution.

* "git cherry-pick" can also utilize rerere for conflict resolution.

* "git clone" learned to be verbose with -v

* "git commit --author=$name" can look up author name from existing
  commits.

* output from "git commit" has been reworded in a more concise and yet
  more informative way.

* "git count-objects" reports the on-disk footprint for packfiles and
  their corresponding idx files.

* "git daemon" learned --max-connections=<count> option.

* "git daemon" exports REMOTE_ADDR to record client address, so that
  spawned programs can act differently on it.

* "git describe --tags" favours closer lightweight tags than farther
  annotated tags now.

* "git diff" learned to mimic --suppress-blank-empty from GNU diff via a
  configuration option.

* "git diff" learned to put more sensible hunk headers for Python,
  HTML and ObjC contents.

* "git diff" learned to vary the a/ vs b/ prefix depending on what are
  being compared, controlled by diff.mnemonicprefix configuration.

* "git diff" learned --dirstat-by-file to count changed files, not number
  of lines, when summarizing the global picture.

* "git diff" learned "textconv" filters --- a binary or hard-to-read
  contents can be munged into human readable form and the difference
  between the results of the conversion can be viewed (obviously this
  cannot produce a patch that can be applied, so this is disabled in
  format-patch among other things).

* "--cached" option to "git diff has an easier to remember synonym "--staged",
  to ask "what is the difference between the given commit and the
  contents staged in the index?"

* "git for-each-ref" learned "refname:short" token that gives an
  unambiguously abbreviated refname.

* Auto-numbering of the subject lines is the default for "git
  format-patch" now.

* "git grep" learned to accept -z similar to GNU grep.

* "git help" learned to use GIT_MAN_VIEWER environment variable before
  using "man" program.

* "git imap-send" can optionally talk SSL.

* "git index-pack" is more careful against disk corruption while
  completing a thin pack.

* "git log --check" and "git log --exit-code" passes their underlying diff
  status with their exit status code.

* "git log" learned --simplify-merges, a milder variant of --full-history;
  "gitk --simplify-merges" is easier to view than with --full-history.

* "git log" learned "--source" to show what ref each commit was reached
  from.

* "git log" also learned "--simplify-by-decoration" to show the
  birds-eye-view of the topology of the history.

* "git log --pretty=format:" learned "%d" format element that inserts
  names of tags that point at the commit.

* "git merge --squash" and "git merge --no-ff" into an unborn branch are
  noticed as user errors.

* "git merge -s $strategy" can use a custom built strategy if you have a
  command "git-merge-$strategy" on your $PATH.

* "git pull" (and "git fetch") can be told to operate "-v"erbosely or
  "-q"uietly.

* "git push" can be told to reject deletion of refs with receive.denyDeletes
  configuration.

* "git rebase" honours pre-rebase hook; use --no-verify to bypass it.

* "git rebase -p" uses interactive rebase machinery now to preserve the merges.

* "git reflog expire branch" can be used