The state Supreme Court will issue its decision at 10 a.m. on the constitutionality of the November ballot measure that reinstated a ban on same-sex marriage. Also to be determined: whether an estimated 18,000 same-sex marriages will continue to be recognized by the state. From the LAT:

Chief Justice Ronald M. George and Justice Joyce L. Kennard will cast key votes in the case. They were part of the four-judge majority that gave gays the right to marry last May, but both indicated at oral argument that they were not persuaded the measure was unconstitutional.

[CUT]

During oral argument in March, every justice expressed support for upholding existing marriages. Justice Carlos M. Moreno indicated he believed Proposition 8 was an illegal revision, indicating he would dissent on that question.

Whatever the outcome, you should expect lots of reaction - and likely protests from whichever group is on the losing side.