Do you speculate that it'll come out tomorrow?
The update has been in Microsoft's hands for over a week now. 4J studios tweeted yesterday that there are no news about it.
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[quote][b]Posted by:[/b] metsjets15 will all the changes in the update be applied to existing maps?[/quote] Some universal traits, like hunger, will be on every world. The new geographical features (ravines, etc.) will only appear n places that you haven't yet visited in your world.