The default font is still Roboto so if you don't find much changes, that means you're still up-to-date.

Google Sans mostly works on Pixel devices and some highlights on stock Android devices.

To find the new emojis, check on this website.

Thanks to @ Shooting Star Max for extracting the files from the Android P Developer Preview 3. I've made his Magisk zip into a Unity installer zip file that allows you to install and uninstall the module easily. I've also uploaded the module to Github and now currently awaiting approval for uploading to the Magisk Repo.Module is now updated to reflect the latest fonts from Android Pie PR2. Latest fonts extract from the Pixel 3 XL factory image.Install through Magisk Repo or manually download the zip and install as a Magisk module.