In short, their changes are intended to remove 3rd party mailings from the Return Path Certified program. IPs which send 3rd party mailings may still qualify for the Safe program (which I think is what they’re calling the former Habeas stuff). They posted a PDF outlining the changes.
Here’s the way it breaks down:
|Sender Type:||Eligible for:|
|Sends only 1st party content||Certified and Safe|
|Sends both 1st party and 3rd party content from different IPs||1st party IPs: Certified and Safe
3rd party IPs: Safe Only
|Sends both 1st party and 3rd party content from the same IPs||Safe Only|
|Sends only 3rd party content||Safe Only|
All in all, this is a good thing. It’s enabling the ISPs who use Sender Score Certified to make better decisions and have better default knowledge about the mail streams that they are seeing. Better decisions make for happier end-users, and happier senders who get to take advantage of what Return Path is offering.