Well it seems that Nickelodeon has indeed cancelled Sam & Cat. The sitcom is ending after one extended season.
A combined spin-off of Victorious and iCarly, Sam & Cat finds Sam Puckett (Jennette McCurdy) and Cat Valentine (Ariana Grande) becoming friends and roommates. To make money they start an after-school babysitting business. Maree Cheatham, Cameron Ocasio, and Zoran Korach co-star.