Casting calls for "Game of Thrones" continue and a report from website Watchers on the Wall indicates that season 6 will introduce: two lords from the north, possibly lords pledged to House Stark; three rebel youths; a "legendary fighter"; and a pair of Dothraki warriors. A video that was leaked online also hints at the introduction of a new red priestess. 

The legendary fighter is speculated by fans to be Ser Arthur Dayne, the wielder of the sword called Dawn. Unlike most Great Houses that own a Valyrian Steel sword, Dawn was crafted from a fallen star or meteorite, making it a very rare and iconic sword. Its wielder is often referred to as the Star in the Morning. 

Ser Arthur Dayne will only appear in a flashback sequence, however, as the books revealed he died many years prior to the main events. He was slain by Lord Eddard Stark at the Tower of Joy during the latter half of Robert Baratheon's rebellion against the Targaryens. 

If Ser Arthur Dayne will be featured, then it stands to reason that there might be flashback sequences showing a young Eddard and Robert fighting against Rhaegar Targaryen and King Aerys II. 

There are also casting calls for a Lord of a Great Northern House and a Lord of a Northern Stronghold, indicating that these could be for members of the Umbers. According to a report from the IBTimes, it is possible that one of them could be Greatjon Umber who was last seen in season 1, hinting that the role may be re-cast. 

A report from Winter is Coming states that a leaked video reveals actress Tehmina Sunny auditioning for the role of Kinvara, a red priestess of R'hllor similar to Thoros and Melisandre. According to the report, the priestess heads to Mereen to help Tyrion and Varys as they govern the city-state in Daenerys' absence. 

"Game of Thrones" season 6 doesn't hit production until July and is scheduled to premiere in early 2016.