In City of San Diego v. Haas, ___ Cal.App.4th ___ (Jun. 29, 2012), the Court of Appeal (Fourth Appellate District, Division One) affirmed class certification of a defendant class (also sometimes called a "defense class").
The opinion relied on both Brinker Restaurant Corp. v. Superior Court, 53 Cal.4th 1004 (2012) and Wal-Mart Stores, Inc. v. Dukes, 131 S.Ct. 2541 (2011) (although the citation of the latter case is a little odd because that case did not address predominance, the issue for which it is cited in Haas). Slip op. at 36-41.