Today the Supreme Court granted certiorari in Cruz v. Arizona, limited to the following question:
Whether the Arizona Supreme Court’s holding that Arizona Rule of Criminal Procedure 32.1(g) precluded post-conviction relief is an adequate and independent state-law ground for the judgment.
You can find the cert-stage briefing—and follow the merits briefs as they come in—at SCOTUSblog and at the Supreme Court website.