Earlier this month, several buttons were added to the bottom toolbar. In the latest builds of Chrome Canary, the interface has been tweaked again. There are no longer two tab buttons and two overflow menus - only the toolbar buttons remain.
Left: Chrome 67; Right: Chrome Canary 69
In addition, you can now swipe left and right on the bottom toolbar to switch between tabs (just as you currently can with the top bar). I'm still not a fan of this new design, but it may end up looking completely different by the time Google is done with it, so I'll reserve judgement until then.