California has four pages of customization options!
The first page lets you choose the kind of indices it has: Pills, Roman, California, Numerals, Arabic, and Hindi. The second page lets you choose between a Fullscreen and Circular look, which then impacts which complications are available to you on the fourth page. The third page lets you choose between four colors: White, Off White, Black, and Blue.
The fourth page lets you choose the complication slots. If you opted for a Full Screen look on page two, there are two complication slots: a text one that provides Date, Digital Time (!), Monogram, Stopwatch, and Timer as options—and a second, more standard Circular complication that was introduced with Infograph Modular.
If you select the Circular layout on page two instead of Full Screen, you get four Corner complications and one Bezel complication, very similar to Infograph's layout, just without the four Circular complications in the middle.
This is a ridiculous amount of customizability for one face—there are so many configurations that it's hard to document its scope and parse through text, so here are a few screen shots.
https://www.icloud.com/sharedalbum/#B135Uzl7VYboK
Now that you've pushed me to check this face out, it's actually becoming one of my favorites.