They're available in the store locked crate (preview has information).
We'll discuss this internally, but the pools were fairly visible when we were testing the expansion.
Sorry, there are no plans to do this.
Pool placement should be somewhat random. We could consider reducing the pool count. However, you shouldn't get the same placement of pools every time you run the map. There also shouldn't be a case where the pools completely block the path. You'll just need to be careful to avoid them.
-ALS
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