I would love to see an updated version of this, though I realize how vastly improbable that is. The second edition with the color pictures was beautiful though.
For that matter I'd love an updated Encyclopedia, which is probably even more of a pipe dream.
Yes, I know the info's all out there on the internet, but in this case I think there's something to be said for being able to hold it in my hands and leaf through the pages.
There is an expanded edition of this that covers DS9
: Star Trek Chronology: The History Of The Future