Asus ZenFone 5Z update adds Selfie Panorama mode, other improvements
Although this can't be considered a major update, it's important for those who bought the ZenFone 5Z for its camera capabilities. Asus announced that the ZenFone 5Z (ZS620KL) is getting support for Selfie Panorama mode with the latest update.
Aside from that, the update is expected to fix an issue with the face unlock feature and adjust battery percentage. There's no mention of any security patches, but these can be delivered separately at any moment.
Expect to receive the update in the coming days since Asus announced its servers will push it in batches. You can check if it's available by heading to Settings / System / System updates.