SimFans.de has finished writing up their preview for The Sims 3: Late Night from the fan event they attended with EA in Munich. They wrote one in English and one in German.
See it here: http://www.simfans.de/specials/sims3_late_night_event/english.php
The preview contains lots of info, answers some user questions and has over 60 pictures.
Remember that you can view the initial tweets from SimFans as favorites on The Sims Wiki twitter: http://twitter.com/thesimswiki/favorites