Of note, there's no mention of Animal Practice or Up All Night, as both have really struggled in September, and encore episodes which had been scheduled have been replaced with encore episodes of Grimm and Revolution.
From the New York Times:
The orders are especially early, well before the fall season competition generally settles in; but NBC has had so little success in prime time lately that it needs to show some confidence in its new entries.
The announcement also serves to bolster the entertainment division regime headed by the top program executives, Bob Greenblatt and Jennifer Salke, who were responsible for selecting the network’s fall slate of shows.
If I were a gambling man, I would give Animal Practice about 2 more weeks before it starts getting the "Titanic deck chair shuffle."