As you probably already found out, there is a real craziness these days about the launch of iOS 14 in 2021 and about the anti-tracking options that it will bring through their Intelligent Tracking Prevention.
From what we could find out so far, the war is with Facebook.

Long story short, if you are running campaigns on Facebook Ads, data available from iOS 14 devices in Facebook Ads Manager will be limited:
- no more age, gender, region, and placement
- there will also be a delay in conversion reporting of up to 3 days
- some data will be only