Yes, there will be two もっと見る The City of ロスト Souls and the City of Heavenly Fire. There will also be two もっと見る in the Infernal Devices series, one is called Clockwork Prince and i think the other is Clockwork Princess. They should be fantastic. I know I'm excited!!!
On the website City of ロスト Souls is 5/1/12, for City of Heavenly 火災, 火 9/1/13. Should be amazing also she is probably going to be very busy making the movie that is coming up soon.