is being injected with new blood!Only ET exclusively premieres the new season 19 promo teasing the latest chapter in ABC's long-running medical drama. The video features Meredith Grey (Ellen Pompeo) proudly marveling over the incoming class of interns at Grey Sloan's rejuvenated residency program, explaining why they all deserve to be walking the hospital's hallowed halls.In the 30-second teaser, Miranda Bailey (Chandra Wilson) is also back to check out the new residents as they gear up for their first big test — dealing with numerous patients with severe brain injuries.