About the received email(「Action required, Important Update」)

I received an email with this subject line on July 4th.
“[Action required, Important Update] Migration Guide for iOS UIKit”

Our service uses iOS UIKit2.2.2.
Please let me know if there is any impact if I continue to use UIKit2.2.2.
If so, what interfaces and modules are affected? When exactly does it mean that the deadline is within 3 months?