The Supreme Court asked two questions, one on the merits of the case, the other on whether the Prop 8 proponents have standing to appeal the case. After discussing why they don't think there is standing, both move quickly on to the merits. The arguments are two-fold, that Prop 8 violates due process of the law, and that it is a violation of the equal protection clauses of the fifth and fourteenth amendments.
As the March 26 hearing approaches, I'll dig into all of the briefs and summarize what to watch for at oral argument. You can peruse all of the various filings at AfER's website.