What about validity of CCIE certification achieved in 2019? Will it expire in 2 years or 3 years?

The validity of your CCIE certification will be 2 years.

Yes, it's true that new CCIE certifications are valid for 3 years but for everyone achieving CCIE certification before 24th Feb 2020, the expiry date of their CCIE certification will be 2 years from the day of passing CCIE exam.

If you recertify after implementation of new updates then the validity will be 3 years of your CCIE certification. 

For more details on Cisco CCNA, CCNP, CCIE certifications, click here -

https://blog.networkbulls.com/cisco-unleashes-new-ccnp-certifications-with-advanced--capabilities