Hi mantrum,
Even there are still enough questions to be answered about what Sy.Str. will be What you call "a basic outline" is in my eyes already far more than you learn about the most other string libraries on the market.
You learn that already the sample content of this first volume is significant more deep sampled than any other Stringlibrarie on the market.
Yes it is a pre-order. If this does not raise your attention enough, you still can wait until it is available. Nobody forces you to enjoy the advantage of the preorder conditions.