Have the same problem as atineoSE, I only see the 10.5.6 beta.
Khedron
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Thank you @CDUVENHORST, of course the problem is that my old MBP is too old. Didn't checked that until you mentioned it.
When it is ready. Or when it needs to be released (like when new devices are available to the market).
Apple is not a company that normally announce release dates in advance, it's not how they operate.
Without speculating on the final release date, you may count on it being a number of beta releases during the summer and the (early) autumn and each beta release tend to have one or a couple of weeks between them.