We have been blessed with a cavalcade of casting announcements from the 2012 San Diego Comic Con. HBO have also announced a premiere date - 31 March 2013. They released a promotional video that premiered at the event featuring several new cast members:

Game of Thrones Season 3 New Cast Members - Comic Con(02:08)
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Newly announced castings are:

Mackenzie Crook as Orell

Nathalie Emannuel as Missandei

Paul Kaye as Thoros of Myr

Thomas Brodie-Sangster as Jojen Reed

Ellie Kendrick as Meera Reed

Richard Dormer as Lord Beric Dondarrion

Kristofer Hivju as Tormund Giantsbane

Philip McGinley as Anguy

Tara Fitzgerald as Queen Selyse Baratheon (specific role announced)

Tobias Menzies as Edmure Tully

Anton Lesser as Qyburn

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They join previously announced new cast members:

1. Kerry Ingram - Princess Shireen Baratheon (announced 1 June 2012)
2. Charlotte Hope - Myranda (announced 28 June 2012)^[1]
3. Clive Russell - Ser Brynden Tully, also called "the Blackfish". (announced 30 June 2012)^[2]
4. Diana Rigg - Lady Olenna Redwyne (announced 12 July 2012)^[3]

What does everyone think of the new cast members?

References

• "Massive Comic-Con Casting Reveals" from Westeros.org, July 13 2012