here is a high summary of what is different, and a link to the full details of the differences:
Section 6.6 ? Added requirement for application code review or application firewall to be used
Section 11.1 Clarified that wireless analyzers should be used periodically, even if wireless is not currently deployed.
Section 12 - Added requirement for a policy to manage connected entities, including maintaining a list, implementing appropriate due diligence, ensuring connected entities are PCI DSS compliant, and having an established process to connect and disconnect entities.
https://www.pcisecuritystandards.org/pdfs/pci_summary_of_pci_dss_changes_v1-1.pdf