(From the printable-version view of threads)
Well, for one thing, the AO banner is still in a purple color, and some people might rather just have a nice ink-friendly version, maybe a very light gray-fill or something. Also, it doesn't seem to filter out the color tags (at least not in signatures). The smileys are okay, but maybe no fill in the new quoteboxes? I dunno.
Also, I don't know if it shows ignored people's posts... Or whether it should or not.