The news outlets are all telling us to update, but until WhatsApp/Apple get their act together, there's no point. Worse still, people won't realise they need to do it again and will remain vulnerable indefinitely.
The problem is iOS AppStore.
If you update via the "Updates" tab, you don't get the latest version.
But if you search for WhatsApp as if installing it for the first time, then you get the new version.
"Affected versions: ... WhatsApp for iOS prior to v2.19.51" from https://www.facebook.com/security/advisories/cve-2019-3568
The news outlets are all telling us to update, but until WhatsApp/Apple get their act together, there's no point. Worse still, people won't realise they need to do it again and will remain vulnerable indefinitely.