Ionic has announced that new Ionic apps will now use WKWebView by default, providing performance improvements such as enhanced speed, reduced memory usage, and better scroll events on iOS. This transition to WKWebView, a more modern webview compared to the older UIWebView, requires developers to install the Ionic repository plugin and address several considerations, such as data migration from localstorage/IndexDB to native storage solutions, correct implementation of CORS due to WKWebView's enforcement of these rules, and adjustments for loading native files. Additionally, authentication services need to whitelist the localhost URL generated by WKWebView. Developers are encouraged to adopt WKWebView for its benefits, and the Ionic team expresses gratitude for community feedback during the plugin's early development.