No official name has been chosen to take Infineon's place--likely meaning it has no title sponsor at the moment. Instead, the track and facility will simply go by its place-name: Sonoma.
Along with the name change comes a domain change: the track's new site is now at RaceSonoma.com.

Temporary 'Sonoma' logo
Page also said the name change--the end of a 10-year naming rights deal with Infineon Technologies--will have no impact on any of the track's activities or scheduled races and events--though the Infineon name and logo will be scrubbed from all banners, advertising, and promotional material.