Untitled Lego Movie Universe sequels

Warner Brothers originally had more movies planned for the Lego Movie universe. Aside from The Billion Brick Race, none of the sequels were given a name.

Plot
The premise of the sequels are unknown.

Why They Are Cancelled

 * 1) The Lego Ninjago Movie and The Lego Movie 2: The Second Part underperformed at the box office compared to their predecessors, although the Unikitty! show is still left.
 * 2) Warner Brothers ended their movie deal with Lego after half of a decade.

The Result

 * After Warner Brothers parted ways with Lego, Universal Pictures acquired the rights to Lego and will be making a different Lego Movie universe not connected to the Warner Brothers one.

Reference
https://youtu.be/3FIIla8Y29o