In this latest release of Hasura GraphQL Engine v2.2.0, new features and improvements have been introduced to enhance the user experience. These include MSSQL upsert and "undo" functionalities, OpenAPI body specifications for better interoperability with REST ecosystems, and nested action types in response handlers. The update also addresses error handling issues in MSSQL by introducing transaction state querying using XACT_STATE() scalar function. These improvements aim to help developers build more efficient software and improve overall productivity.