Did you notice that the new agreement isn't posted live yet? They sent the e-mail, but if you click on the links it shows the current agreement, not the one that goes into effect tomorrow.
Last Fall Value Added Resource posted a comprehensive account of what changed (link).
This is the brief overview eBay sent out today:
Notable changes:
•Payment terms now reflect eBay's migration to managed payments.
•We may publish and promote your listings on platforms belonging to other eBay corporate family members and/or third-parties.
•Ways eBay can use personal data have been brought in accordance with our User Privacy Notice.
•Transaction terms regarding eBay's Authentication Guarantee programs have been updated.
•More details are available on eBay's policy with respect to sharing credentials.
It looks like the Authentication stuff and the credential sharing are probably going to be the biggest changes. It will be interesting to see if anything unexpected was added into the Payments section.