It appears that they use language (or country) detection

URL of the page ?

http://google.com/games10

Nice Google is promoting the Olympic Games (Read Google Maps / Street View etc.) very big. Almost on every local homepage there is a link to Google Maps and next week a series of special doodles will follow.

Sorry, example of URL:

http://www.google.com/intl/fi_ALL/landing/games10/index.html

Even a simple Google search triggers bolded text
'The 2010 Winter Games begin Friday, February 12, 2010.' and logo

http://www.google.com/images/wintergames10/Torch44.png

From Picasa:
http://picasa.google.com/intl/en/explorethegames.html#utm_campaign=fi&utm_source=wintergames-main&utm_medium=et

The text mentioned at http://blogoscoped.com/forum/167409.html#id167419

is localized:
Vinterspelen 2010 börjar fredagen den 12 februari 2010, Die Winterspiele 2010 beginnen Freitag, 12. Februar 2010, Los Juegos de invierno de Vancouver empiezan el viernes 12 de febrero de 2010, I Giochi invernali 2010 inizieranno venerdì 12 febbraio 2010, Les Jeux d'hiver de Vancouver débuteront le vendredi 12 février 2010...

Related discussion:

http://bbs.keyhole.com/ubb/ubbthreads.php?ubb=showflat&Number=1304619

iGoogle gadget (not by Google):
http://www.googleminiapps.com/8507/fun-games/vancouver-2010-olympic-winter-games-official-minigame-gadget/

Google about Vancouver games

http://googleblog.blogspot.com/2010/02/vancouver-forecast-light-winds.html