Right now, redirect pages are limited to rendering the usual redirect information, plus categories at the bottom. It would be pretty cool if, for example, templates could be rendered as well, either on the first line, or after it, or on any line, or whatever. This is related to bug 927 but is not identical; that one was closed as FIXED because the specific problem of text after the first line not being rendered has been fixed. However, this only means that categories after the first line are rendered; it's still the case that no other kind of text on any line is rendered.
So what, if anything, is preventing the possibility of other text rendering? Could we see this in a near-future update?