Paypal Express Checkout and Paypal IPN changes

We just received an email from Paypal indicating that they are going to make changes to their IPN system. Their email contained the following:

If you are directly integrating data from the IPN process and/or the Case report into your systems, you will need to ensure that your configuration will accept the format change for the unique dispute identifier as outlined here.
Data passed contains a case_id value. This value will now be formatted in two ways:
• Existing format: PP-XXX-XXX-XXX-XXX
• New format: PP-D-XXXX
For the new format, XXXX is an integer. The “D” indicates the case is a dispute.
Effective July 15, cases will be identified using either ID format until the transition to the new dispute management system is complete. This is expected to take several years.
As a best practice, merchants are encouraged to integrate flexibly so that any future changes to the unique case identifier can be made without integration changes.


Will this affect anything if we're using Paypal Express? The cart version is 1.5.6.4. I thought that Paypal Express doesn't use IPN, but I could be wrong. I do see that in the Express checkout screen there is an IPN URL for subscriptions,

Any replies or comments? I know there are a ton of people using Paypal so this must apply to many people.