Via TVLine, it is announced that casting for Sinbad and Scheherezade are underway*
Update: Morpheus is also reported to make an appearance tvline.com/2016/06/27/once-upon-a-time-season-6-spoilers-hyde-regina-ask-ausiello/
*As in last summer's casting announcement for Rumplestiltskin's mother, this could be a bit of light mischief, a misdirection to keep the real identities of the new characters a surprise.
Tvline.com has reported that Ava Acres will play young Regina and Isabella Blake-Thomas will be young Zelena on an upcoming episode of Once Upon A Time.
Gaston recast! Variety.com has
reported that Wes Brown
will appear as Belle's
ill-fated ex-fiance in 5b,
EastEnders star Adam Croasdell has been tapped to play Hook’s father on Once Upon a Time, EW has learned exclusively.
Details on his role are being kept under wraps, but executive producers Adam Horowitz and Edward Kitsis recently announced his arrival at NYCC, where they divulged that an episode prior to the show’s winter break would delve into Hook’s (Colin O’Donoghue) past.
Read more at EW
OUAT has inked deals for more recurring guest roles: Elliot Knight has been tapped to play Merlin, and Joana Metrass is set to play Guinevere.
In addition, Andrew Jenkins has nabbed the guest role of Percival, one of Arthur’s most loyal knights.
Read the full story at Deadline
Once is seeking an actress in her mid-20s to early 30s to play the “stunningly beautiful” Evanna, who is described as “plucky, strong and imbued with an unshakeable sense of self-confidence.” Evanna sometimes acts before she thinks, though unlike her son she never acts out of pure self-interest. Rather, her noble spirit stands in stark contrast to the now-dark soul of her offspring.
Candidates must also be able to pull off a Scottish accent.
Read more at TV Line