Base has announced the upcoming launch of its Cobalt upgrade in September, introducing three significant user experience improvements. The upgrade will feature Sponsorship, Batch Calls, and Session Keys. Sponsorship will enable applications to cover transaction fees for users, effectively allowing for free Gas transactions. Batch Calls will allow multiple transactions to be bundled into a single operation, streamlining processes and reducing operational steps. Session Keys will permit users to authorize applications to sign transactions on their behalf within a defined scope, minimizing the need for repeated authorizations.