I heard that Vivendi finally shut down the Sierra office in Bellevue, which would mean that Sierra no longer makes games and exists only in the fact that Vivendi owns the Sierra trademark and the rights to most of Sierra's games.
Here is what Wikipedia has to say:
"In June 2004, Vivendi reorganized the Vivendi Universal games group, distributing Sierra's work to other units and finally shutting down Sierra's Bellevue location in August. The Sierra brand lives on in name only."
Wikipedia