What the **** is Google doing with their operators?

I know only [define:] is official (cf. http://www.google.com/help/cheatsheet.html and http://www.google.com/help/features.html – nice icons by the way) but come on!

April 2009: <<Here's a quick way to translate text directly from Google Search. Type the language pair, followed by the text you want to translate. For example, to translate "I love you" in French, search Google for: [en:fr love]. You can also type [translate love in french], but this query is longer.>> http://googlesystem.blogspot.com/2010/04/shortcuts-for-google-translate-and.html

Now:
http://imgur.com/JpQqN.png
http://imgur.com/WLQUb.png
http://imgur.com/t55Kp.png
http://imgur.com/4DCFH.png

Even [en:en] doesn't work anymore: http://imgur.com/Q4bvO.png
Compare to http://googlesystem.blogspot.com/2010/07/new-format-for-googles-definition.html (July 2010).

I hope [OR], [AND], [-] and [+] will keep working!

It has been turned off few days after Ionut's post.
http://blogoscoped.com/forum/172296.html#id172326

en:en still works

http://www.google.com/search?q=en:en+love

These strange operators have never been officially documented, so they can stop working at any time.