1.7 is pre Dawnguard.
I CONJECTURE that they could not release patch 1.6, because it was too buggy. So, instead, they rolled it into patch 1.7 - and removed some of the promised fixes. Yes, money is part of the issue - in addition, this way, some casual skyrim gamer will be lured into buying dawnguard.
I, will not buy dawnguard. Because support on the PS3 will be horrible. Bethesda got my money once - but they will not get anymore of it. I'll make sure to buy the next TES game from gamestop. Or the seedy underbelly of the intertubes.
