This seems like a great adventure, but it seems like there is absolutely no possible way to purchase it at this time, which really make the whole thing into a kind of insulting tease. I disagree that a review makes sense, if I'm correct that there is absolutely no way to purchase it - a review with a massive disclaimer saying "You cannot purchase this or in any way legally get hold of a copy at this time or for several months" would have made sense.
It is certainly purchaseable. It requires that you purchase another adventure at this time.
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I have to agree with the wiki that this is likely the best 4e adventure in existence at this time (from what I have seen). For many people, the cost and complications of the Open Gaming business model are well worth it.
Open gaming has consistently been nominated (and won) ennies, and for good reason. The adventures from them/Wolfgang Baur are consistently 5 star quality.