Android P feature spotlight: Adaptive brightness animates the quick settings slider as it changes
Android P feature spotlight: USB menu gets revamped, lets you transfer files and charge a connected device simultaneously
[Update: Solution] Android P feature spotlight: Battery menu no longer includes per-app usage data
Android P feature spotlight: You can now easily track which apps recently sent notifications
[Update: Still there, just hiding] Android P feature spotlight: System UI Tuner is nowhere to be seen
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The name of the game in Android updates is usually adding features, but occasionally we lose something. That seems to be the case in the battery menu. In past versions, you could see per-app battery usage in the system settings. In Android P, that's all gone. You can, however, see app usage in the developer options.
At first glance, you might not even notice there's anything missing from the battery menu on Android P. Just scroll down to the bottom, and you'll see there's no list of how much battery each app consumed. There's a simplified item near the top that tells you how heavily your phone has been used (eg. "Battery is in good shape"). If it's deemed "heavy," you can pull up a list of the top few apps by battery usage. In the developer options, you can access full usage data via the "Android 8.0 battery settings" menu right near the top.
I wouldn't get too stressed about this change just yet. The fact Google included the full Android 8.0 battery settings page suggests there are things in the Android P battery menu that aren't complete yet. This is just the first developer preview, so additional battery stats could come to the Android P settings in the next release.
As pointed out in the comments, there's a flag in developer options (settings_battery_display_app_list) that can add the battery stats to the Android P menu. It's under Feature Flags.