I would really like to see structured text that is self-descriptive (e.g. this is the document title, this is a paragraph, this is a header, bullet list, etc.) but have no ability to influence HOW those things are displayed- eventually maybe we'll have browsers that can support rich theming, etc.
Others have noted that lack of images is an oversight. Perhaps the language needs a "binary file download" structure, and if the binary in question is a media file, then the browser could choose to display it. Maybe signal with mime types?