John Myers reports for the Los Angeles Times this evening: “A prominent environmental group [the Planning and Conservation League] took legal action on Monday to block Proposition 9, the proposal to split California into three states, from the fall ballot.”
The filing is in the Supreme Court (it has not been docketed yet) and is not surprising. (See here and here.)
There’s a decent chance the court will quickly request a preliminary opposition, but that wouldn’t guarantee any positive action by the court. Such a request could be just as quickly followed by a summary rejection of the initiative challenge. (See, e.g., here.)
[Update: the Supreme Court has docketed the writ petition in Planning and Conservation League v. Padilla.]