It has been officially announced that Wrong Turn 5 has started filming, with Doug Bradley leading the new cast. We have the official announcement, including cast and plot details:

"Twentieth Century Fox Home Entertainment has started production on the next installment of the horror genre hit, Wrong Turn. Director and writer Declan O’Brien (Wrong Turn 4: Bloody Beginnings, Sharktopus) returns to the helm of his third film in the franchise, with Doug Bradley, best known for his role of ‘Pinhead’ in the Hellraiser films, leading the cast. Filming is underway in and near Sophia, Bulgaria and is expected to end May 5.

In the next chilling chapter of Wrong Turn, a small West Virginia town is hosting the legendary Mountain Man Festival on Halloween, where throngs of costumed partygoers gather for a wild night of music and mischief. But an inbred family of hillbilly cannibals kill all the fun when they trick and treat themselves to a group of visiting college students who are dying for a good time.

The film is slated for release on Blu-ray and DVD later this year."

The official cast list includes: Camilla Arfwedson, Doug Bradley, Simon Ginty, Oliver Hoare, Amy Lennox, Paul Luebke, Duncan Wisbey, Kyle Redmond - Jones, Peter Brooke, Radoslav Purvanov, Georgi Karlukovski, Roxanne McKee, and Bobi Iliev.