User blog comment:Sarah Manley/New Editor Scheduled for Sitewide Release/@comment-1946662-20110915124651/@comment-126761-20110915133728

Do you mean, when viewing the saved page (rather than in the editor)? If so, it's a technical issue - it's easier to add code to a page, then remove it. If from the edit page itself, that should certainly be possible - in visual mode, just roll over the category name to get a delete icon