Charles Cooper, arguing for Proposition 8, conceded that opposition to gay marriage is likely to fail in the long run, as reported by the Huffington Post, here.
Update. March 27: Oral arguments and transcripts are in a separate location at the bottom of the web page. "Final" versions of the arguments will be posted in the normal place on Friday, March 29. Here is the link for March 26, Hollingsworth v. Perry.