Four new Android 14 Project Mainline monthly updated modules are
1. ConfigInfrastructure
2. HealthFitness
3. Remote Key Provisioner
4. Time Zone Data (v5)

As you're well aware, ever since Android 10, Google has been updating over
two dozen core modules over the Internet using the Google Play Store update
mechanism (where the Project Mainline monthly updates are so seamless, most
people don't even realize every Android phone above 10 is being updated).
�<https://source.android.com/docs/core/ota/modular-system>

Mainline is also responsible for delivering several new features to older
devices. Android 13's Photo Picker, for example, was backported to Android
11-12L thanks to a Mainline update.
<https://www.androidpolice.com/project-mainline-android-14/>

Here are the four new Mainline modules to be monthly updated in Android 14.

ConfigInfrastructure:
Config Infrastructure provides an updatable DeviceConfig implementation.
DeviceConfig is the API used by Google Play Services to remotely toggle
flags that control various Android system features. For example, before
Android 14 Beta 4, the availability of the split notification & ringtone
volume sliders was controlled by a DeviceConfig flag.

HealthFitness: This contains the Health Connect app and related APIs. Since
Health Connect is now baked into the OS, you won't need to download the app
from Google Play anymore, plus it'll work on devices without GMS. For users
who have already downloaded the Health Connect app from Google Play, Google
has begun migrating users over to the system version. HealthFitness also
contains the backup and restore app, which may eventually enable
cloud-based backups of Health Connect data.

Remote Key Provisioner:
This contains the Remote Key Provisioning app and system service.

Time Zone Data (v5):
Okay, this is not really a new module. Every version of Android has its own
OS-specific Time Zone Data module. Android 14 is the fifth release that
supports Mainline, so we're now at version 5 of TZ data.