I wonder whether the large gab between releasing the DS3-pack in the different territories is because NA and Europe is still stuffed with the old skus. They are still selling 20GB model in Japan, so maybe the chain is quite empty there, which allows the new sku to appear so much before anywhere else.
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Good question. Maybe this is a "tongue in cheek" move to the Japanese market just like the Japanese price cut at last years TGS.
Another reason to postpone the release in the Western markets might be that it is a way to save a couple of dollars on the BOM and transfer those saved dollars to a cheaper SKU later this fall for the holiday season.
The parents buying a PS3 for their children are most certainly more concerned with the price than wether the SKU has rumble or not. I don´t expect the voices at neoGAF or this discussion board to be representative for the market in general on this issue.
In the beginning of next year they may have achieved some further cost reductions and will add the rumble controller without increasing the BOM.