From the Super Mario Wiki
Spiral Mountain is a downloadable stage set to appear in Super Smash Bros. Ultimate, set to release with Banjo & Kazooie in the fall of 2019. Originally debuting in Banjo-Kazooie, it serves as the home to Banjo and Kazooie in the series.
The reveal trailer for Banjo and Kazooie showed off the stage and various aspects of it. Characters from the Banjo-Kazooie franchise are shown to be appearing, including Bottles the mole, Gruntilda the witch and her broomstick, and Mumbo Jumbo. Gruntilda's Lair and Banjo's House are also visible. The trailer seems to imply that the camera will pan around the hill over time, with the characters shifting their position accordingly.
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