The Supreme Court ruling in Trevino v. Thaler is available in Adobe .pdf format.
First word of the ruling comes from SCOTUSblog:
Amy Howe: First is Trevino v. Thaler. Opinion by Breyer, but in his absence it is being announced by Kennedy. Fifth Circuit is vacated and remanded. Vote appears to be 5-4.
Holding: When as here a state's procedural framework by reason of its design and operation makes it highly unlikely in a typical case that a defendant will have a meaningful opportunity to raise an ineffective assistance claim on direct appeal, the exception recognized in Martinez v. Ryan applies. (It is an exception to the procedural bar rule.)
The Chief dissents, joined by Alito; Scalia wrote a dissent, joined by Thomas.
At issue was whether the Supreme Court's 2012 ruling, Martinez v. Ryan - that prisoners who have compelling claims of ineffective assistance of trial counsel can have those claims heard even if an ineffective state habeas lawyer's failure to raise those claims would have otherwise barred them from being heard in federal court - applied in Texas. The 5th Circuit had held that it did not because of Texas criminal law procedures.
Earlier coverage of Trevino begins at the link.
I'll update with additional news coverage as it's posted.