The default .blend hasn’t been updated yet, so you’ll need to create a new brush and change its tool to “Clay strips”. Note that the tool property is now in the Brush menu rather than the toolbar.
Unlike the other brushes, the clay strips brush uses a cube test to define its area of influence (as opposed to a sphere.) The brush curve still behaves normally, so you can choose between a full cubic effect or a softer look that blends better. In the image above, the three embedded cubes were drawn with a flat brush curve and anchored stroke mode; the rest uses spacing stroke with various brush curves.