NBC hasn't specified how many episodes each renewal is for. Both are mid-season shows, and, given their popularity, it wouldn't be surprising if the network bumped them both to fall debuts, giving each show a full 22-episode order, but that likely won't be confirmed until the network's official upfront presentation next week.
Hannibal is averaging a 1.4 rating in the 18-49 demographic, with 3.4 million viewers tuning in each week. The show, which stars Mads Mikkelsen, Hugh Dancy, Caroline Dhavernas and Laurence Fishburne, is also the youngest-skewing 10 PM drama on all of the major networks, with a median age of 48.2 years old. Hannibal wraps up its second season on Friday, May 23 at 10 PM ET with "Mizumono".
About a Boy, which stars David Walton, Benjamin Stockham and Minnie Driver, has averaged a 2.4 rating in the 18-49 demographic with 8.3 million viewers per episode. That being said, it does benefit from airing on Tuesday's at 9 PM after the network's reality TV powerhouse The Voice, although it isn't known if the network plans to keep the show in its current air date. The comedy series wraps up its 13-episode first season on Tuesday, May 20 at 9 PM ET with "About a Rib Chute".
On the other side of the spectrum, NBC has cancelled first-year programs Growing Up Fisher, Crisis and Believe, just hours after pulling the plug on Revolution and Community. The only two network shows whose fates still haven't been decided yet are Dracula and Parenthood.