SUPEE-7405 v 1.1 patch bundle includes the following:
Cart Merge Patch (SUPEE-7978)
Carts with identical items now merge correctly. Previously, when a cart with one item was merged with another cart that contained the same item, Magento did not merge the cart totals correctly.The cart now includes only one item, and the total is correct.
SOAP API Patch (SUPEE-7822)
The Magento SOAP API now works as expected. Previously after installing the SUPEE-7405 v1.0 patch, an API request would cause a 500 error, and Magento would log an exception.
PHP 5.3 Compatibility (SUPEE-7882)
The patch was not compatible with PHP 5.3 for earlier versions of Magento that were still supporting this version. The issue experience by merchants was inability to view sales information in the Admin.
Upload File Permissions
The patch restores less restrictive file permissions (0666 for files and 0777 for directories) as more strict permissions introduced by the original SUPEE-7405 patch cause many merchants not to be able to view uploaded product images, depending on hosting provider configuration.