When does Unikitty! return?

The series is based on and stars the character of the same name from The Lego Movie franchise. Princess Unikitty is the princess of the Unikingdom who is a cat/unicorn hybrid. Her brother Prince Puppycorn is her younger brother. Dr. Fox is the castle's resident scientist whose experiments and inventions can both create and resolve problems.
As the ruler of the Unikingdom, Princess Unikitty has various misadventures in her land with her brother Prince Puppycorn, scientist Dr. Fox, bodyguard Hawkodile and advisor Richard. They also deal with the threats of Master Frown from the neighboring Frown Town.