This new Version is a complete new approach on how to load TinyMCE. It's much faster and will need even less bandwidth, as the TinyMCE core gets only loaded once during the entire BE session.
we now also provide different default configs for different situation. You can just choose them from the Extension Manager. This selection can be overwritten with pageTS to provide configs that work no matter what is configured within the Extension Manager.
This features a lot of changes - if you upgrade please make sure you clear the TYPO3 and Browser Cache. Restart the whole BE and/or Browser.
tinymce_rte now also requires TYPO3 4.2.