In addition to those two, three more have left Infinity Ward. Lead character artist Joel Emslie announced his departure on Facebook, along with artists Ryan Lastimosa and Brad Allen. Either these three have yet to join Respawn -- or they have yet to get over to LinkedIn to announce that they've joined Respawn.
Update: Lastimosa and senior level designer Jason McCord have joined Respawn, GameSpot reports. Three more IW staff have announced their departure from IW as well.