ZK-Snarks in Byzantium

I had heard for a while that the byzantium update would "integrate" zk-snarks in Ethereum. I read a lot of articles about what it is, why it's great, etc. And then, from the day the upgrade was out, nothing. I can't find anything on how it's been implemented, how can one use it, what that changes for users, for developers... Basically I can't find any info about it that dates from later than end of September.
Is there something dramatic that I'm missing? Anybody can point to some links about how to use the new features?
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