Neil Marshall, director of The Descent, Centurion, Doomsday, and most notably the epic Game of Thrones episode "Blackwater," has signed on to direct the final installment of season 4. As fans who've read the books and have surmised what he'll be filming can tell you, this is A Very Good Thing.
Mild spoilers (although even TV-only viewers should know this is coming): Marshall has confirmed the final episode of season 4 will be the battle between the Night's Watch and Mance Rayder's Wildling army at Castle Black. Seeing as "Blackwater" was so insanely awesome, I'd say we're in for a treat — especially because, as Empire reports, Marshall directed "Blackwater" at the last minute, while he has months to prepare for this episode.