it looks like an act for marketing...

"now you get "beta"-patches, that's even better for the community" or something

really
i think it's just because they want to get rid of the hughe ammount of patches like 1.1, 1.11, 1.12, 1.13, ...
like this they can release serveral "beta" patches so they only have to release 1 REAL patch

it's marketing

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