According to my math, as of this posting there are only two months, 19 days until the One version is released, and the 360 an unknown but similar length of time. When will the next release of information be, to possibly calm down us nutcases.
Alas, that isn't up to us I'm afraid- Microsoft are running official updates and announcements for Zoo Tycoon.
Most announcements and updates for games typically crop up around the time of trade shows and expos though. The next major show will be Eurogamer in a few weeks time, so maybe you'll hear more about Zoo Tycoon then.