Mass Effect 3 CE Information

While going down the list of features this caught my eye:

Exclusive “Bonus Squad Appearances” (Ashley Williams, Liara T’Soni, James Vega and Kaidan Alenko)

Does that mean their missions are only playable in the collectors edition of this video game? Liara was my love interest for Mass Effect and during my play through of the first game I chose to kill Ashley. Kaidan and Liara should be in my game regardless based on the choices I’ve made.