We finally have confirmation...sorry Liam Neeson, you'll not be needed this go round as Matt Nable has been cast to portray the leader of the League of Assassins, Ra's al Ghul. Stephen Amell tweeted the news before The CW confirmed it.
J.R. Ramirez
'Arrow' Casting News
The casting news never seems to end with CW's 'Arrow.' It seems they've added another familiar DC character to guest star. Amy Gumenick (Supernatural) has been cast to play Carrie Cutter aka Cupid in episodes six and seven when 'Arrow' returns for season three. Cupid has a deadly obsession with Green Arrow in the comics, and it'll be fun to see that play out...maybe not so much for Ollie.
'Arrow' Recasts Katana
It was announced a few weeks ago that Devon Aoki would be joining the cast of Arrow for Season 3 as a recurring character. It seems that due to scheduling conflicts, she'll have to leave the show. But fear not, Katana-fans, she's already been recast by someone familiar to the comic book universe. Rila Fukushima (The Wolverine) will be replacing Aoki as Tatsu Yamashiro aka Katana. While we have no confirmation yet, I think its safe to assume we'll be seeing Tatsu in Oliver's flashbacks, but I'm hoping we also get to see her in the present time as well...perhaps fighting alongside Canary, and a fiery red-head named Barbara?