According to Conan movie blog Lailia Rouass, who is best know for her role as Dr. Sarah Page in the british t.v. series Footballers' Wives will infact be playing Conans mother.
Rouass role will only be featured in the first 20 minutes or so untill her death.
"[ ISLENE ] She's in her 20s, Caucasian, beautiful, courageous, Amazonian built, pregnant with her son, Conan. She is stabbed through the belly by an Aesir Raider. Her dying request to her husband, Corin, is to take the baby from her womb before she dies so that she can see him"