There have been some recent changes to the upcoming Comic-Con Panel. Lena Headey (Cersei Lannister) had a scheduling conflict and will no longer be able to attend. Rose Leslie, who plays wildling Ygritte, will take her place. Also, Kit Harington (Jon Snow) is recovering from a broken ankle and will not attend. No word if another cast member will replace him.
Thankfully, Emilia is still confirmed to attend. I will post further updates if I hear them.