Because:Man, where do you get that from? How is that a more logical conclusion from @mearls ' tweet than simply assuming the character generation information will just be in the box?
a) The product page for the boxed set does mention prefab characters but doesn't mention chargen rules.
b) The boxed set is $20, which means they must have been counting every penny and begrudging every inch of space.
c) They only have 32 pages for the "how to play" booklet, which is barely more than the size of the playtest "How to Play" PDF (29 pages).
d) A box which includes prefab characters does not actually need chargen rules to be playable.
Therefore, while it is possible the box will include chargen rules, it seems much more likely that all such non-essential things would be provided in an online supplement instead. I bet they'll have other goodies too, like a low-level bestiary. It's the perfect way to offer a fully functional starter set while keeping the price down.
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