We had reported earlier on the willingness of Switzerland to apply the 2007 Lugano Convention in 2011.
Switzerland has indeed ratified the Convention on October 20th, 2010. The notice of the ratification to the Contracting Parties can be found here, and includes Switzerland’s reservations and declarations.
Switzerland’s official documents therefore provide that the Lugano Convention entered into force in Switzerland on January 1st, 2011. The Convention was meant to enter into force on the first day of the third month following the new ratification.
Thanks to Rafaël Jafferali for the tip-off