While we are still far off from a full English voice cast announcement, Aniplex of America have announced at Sakura-con the voice actors for the lead characters of Sword Art Online – Kirito and Asuna.
The male lead Kirito is being voiced by Bryce Papenbrook, who has had a couple of voice roles over the years including as Masaomi Kida in Durarara!! (Another Aniplex of America title) and Shugo in .hack//Legend of the Twilight Bracelet. On the other hand, female lead Asuna is being voiced by Cherami Leigh who has an extended voice role listing including Lucy Heartfilia in Fairy Tail and Shana in the most recent releases of Shakugan no Shana.