The official press release from Eon says:
Commenting on the announcement, Wilson and Broccoli said, “We are fortunate to continue in the Bond tradition of attracting the finest international actors for our starring roles. Mathieu [Amalric] in the role of Dominic Greene, a leading member of the villainous organization introduced in CASINO ROYALE, will be a powerful counterpart to Daniel’s portrayal of Bond. Olga Kurylenko will play the dangerously alluring Camille, who challenges Bond and helps him come to terms with the emotional consequences of Vesper’s betrayal.”
The press release adds that Fields is an MI6 agent, and that Judi Dench, Jeffrey Wright, and Giancarlo Giannini are returning to their roles from Casino Royale.
Two quick comments. First, Amalric had previously been reported as “Maurice Green;” this is definitely a better name. Second, in regard to Gemma Arterton: Told you so!