A long time ago, Google experimented with moving some Chrome interface elements to the bottom on Android devices. The company has long scrapped these tests, and even though Chrome for iOS offers an optional bottom-based interface these days, we don’t see anything remotely like it on Android. This could finally change soon, but it looks like the bottom bar will only be used for some very specific activities.
One possibility is that the usual Discover, Search, and Saved shortcuts from the Google app’s bottom bar will remain visible when a custom tab is open. We could also see some Google-specific features like a quick shortcut to Lens or a button for additional search results on the topic. Those are both just educated guesses, though.
Based on the descriptions from Google, the bottom bar should still be a lot more limited than it is on Chrome or even the Google app on iOS. The two Google apps offer navigation buttons and browser features like tabs and a homepage shortcut at the bottom, which is helpful due to the ever-bigger screens the best phones out there have.
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