How about the last chance quest
It says that it will be advance the time
And see the children you made before
At best the new update is always ~2 weeks after the last one, which would mean it's done next weekend. But that doesn't always work out as planned, so I don't make any promises. ;)
Also, I add 1 day to it for every person that asks when the next update is due to make sure I don't get flooded with that question. :P