It was announced in August and released in mid-September. Information should be available, or at least accessible, through the same link above.
here, provided by Gill-man (many thanks to him, btw). Just click there and scroll farther down for the chronologies book,
"Across Time and Space: The Chronologies of Babylon 5".
Essentially, it's a printed version of the Chronologies created by Terry Jones (not from Python fame
) and another gentleman. Completely different works but both impressive. They cover the entire spectrum of events detailed in all of the B5 works - series, movies, books. Terry Jones' originally appeared in the official B5 magazine at one point.