I got an email also, but nowhere did they say payment notifications were among those emails that are being canceled, just:
* The email you receive when you cancel an order (Merchant cancel email: ID# PP594)
* The email your customer receives when you cancel an order (Buyer void email: ID# PP592)
* The email you receive when funds move out of your customer's PayPal account (Merchant capture email: ID# PP593)
* The email your customer receives when funds move out of their PayPal account (Buyer capture email: ID# PP591)
* The email you receive after you initiate a refund to a customer (Merchant refund email: ID# PP286)
More info at
https://cms.paypal.com/us/cgi-bin/marketingweb?cmd=_render-content&
content_ID=marketing_us/email_enhancement