The Frigade Forms SDK has introduced support for asynchronous validation between steps or pages in a form by utilizing the validationHandler prop on the <FrigadeForm /> component, allowing developers to prevent users from proceeding to the next step until an asynchronous call, such as a database or API request, is successfully completed. This feature, showcased in the onboarding flow of Frigade's own application, ensures that users are prompted to wait for the validation process via a loading indicator, enhancing the reliability of form submission processes. Developers can implement this functionality in their codebase by updating to @frigade/react version 1.35.29 and using the validationHandler to manage async validations effectively.