It was out two weeks prior to release on the 360:D
Also I feel the game offers less replay value due to the lack of attributes - it's only a matter of laying out your perks differently, and that's about that. To add to this, some skills are almost required if you want your character to be powerful: Enchanting lets you compensate for areas where you are lacking (my warrior turned super über mage with enchanting 100 and certain sets of enchanted gear, without me assigning perks to any of the magic skill trees) and blacksmithing lets you upgrade your gear no matter what class (unless you go strictly mage-in-robes, which sucks even with the relevant perks).
But thanks for the info on the construction set - I hope for a "total overhaul" mod to offer some "proper" replay-value.