UltiSnips 3.2

• This is the first release done again by @SirVer. And this is also posted on vim.org again. ¯\_(ツ)_/¯
• This is the last version to support Python 2.
• Syntax highlighting improvements: a new one for unite & tweaks to others.
• Support for transformations on multiple lines.
• Python interpolation got more powerful, for example tabstops can now be modified in python interpolation, you can access the last changed placeholder text and more.
• Support for deoplete.
• Snippet files are no longer watched for changes. This increases performance, but also means that if you change your snippet files outside of Vim, UltiSnips will not know about it. You need to run :call UltiSnips#RefreshSnippets() or restart Vim.
• Text objects for selecting snippets in visual mode: iS, aS

UltiSnips 3.1

• This is the last release done by @SirVer. The new maintainer of UltiSnips
  is @seletskiy. The repository remains https://github.com/SirVer/ultisnips,
  so this should not affect any users. This is also the last release to be
  published on vim.org. Please follow the master branch on GitHub for the
  latest stable version.
• New option e: Context aware snippets. This gives very precise and
  powerful control over which snippet should be expanded depending on
  surrounding code. UltiSnips-context-snippets
• New option m: Trim whitespace in all snippet lines.
• Very powerful, freely configurable pre/post-expand and post-jump actions
  allow for transforming the buffer outside the snippet. UltiSnips-snippet-actions
• Automatic triggering of snippets without the need to press the expand
  trigger. UltiSnips-autotrigger
• Better error reporting for snippet errors including python stacktraces
  and listing of executed code.
• Undo is more granular. Each jump and expand is now a separate undo step.
• UltiSnips now emits autocommands on certain events. UltiSnips-custom-autocommands
• clearsnippets now clears all snippets below the current priority. This
  fits better with the priority system introduced in 3.0.
• snipMate snippets support can be disabled. UltiSnipsEnableSnipMate
• UltiSnipsEditSplit got a new value 'context'. UltiSnipsEditSplit
• Improved syntax highlighting for snippets filetype.
• Mappings and autocommands are now only established when needed, i.e. when
  a snippet is active. This boosts performance outside of snippets.
• New integration with Unite, TagBar, and deoplete.
• New Ctags configuration file for snippet definitions.
• Bug fixes, performance improvements, code cleanups and refactorings.
• No longer supports Vim < 7.4.

UltiSnips 3.0

• Organisational changes: The project is now hosted on github. Snippets are
  now shipped separately - please track honza/vim-snippets.
• UltiSnips is now a drop in replacement for snipMate - it parses snipMate
  snippets and expands them emulating snipMates smaller feature set.
• Filetype tab completion for UltiSnipsEdit.
• UltiSnipsEdit now only edits private snippet files. Use UltiSnipsEdit! if
  you want to edit shipped files.
• New option 's' which strips trailing whitespace before jumping to next
  tabstop
• New option 'a' which converts non-ascii characters into ascii characters
  in transformations.
• New keyword in snippet files: priority defines which snippets should
  overwrite others. This deprecates the '!' option.
  UltiSnips-adding-snippets
• Remove common whitespace of visual line selections before inserting in an
  indented tabstop.
• Support for overwriting the snippet directory name on a per buffer basis
  to support per project snippets. UltiSnips-snippet-search-path
• The keymaps for jumping in snippets are now only mapped when a snippet is
  active, allowing them to be used for something else otherwise.
• Expanding and jumping no longer overwrites the unnamed register.
• Integration with Valloric/YouCompleteMe and Shougo/neocomplete.vim.
• Other plugins can add sources for snippets to create snippets on the fly.
  UltiSnips-extending
• Vim functions now indicates if it did any work.
  UltiSnips-trigger-functions
• For python extensions: UltiSnips adds itself to the sys.path and can be
  easily imported if it is available. UltiSnips-python-module-path
• A new function giving programmatic access to the snippets currently
  available for expansion for other plugins integrating with UltiSnips.
  UltiSnips_SnippetsInCurrentScope
• New or improved snippets (now in a different repo): all, bib, c, cpp, cs,
  d, django, eruby, go, haskell, html, html, htmljinja, java, javascript,
  js, ledger, ocaml, perl, php, puppet, python, ruby, scss, sh, tex, vim,
  xml, zsh.