You don't need citations, it's just simple logic. The less equipment in the game, the less you have to spend on hours to create the graphics for that equipment. With a development cycle of roughly 1 year, they are looking to create a game which can capitalize on the financial success of DA:O as quickly and as cheaply as possible so as to maximize profit.
It wouldn't be such a huge surprise to me if DA:O went over its budget, and part of the deal they inked with EA was that they would absorb some of the costs (since the acquisition happened after DA:O development started), IF Bioware would work their asses off to quickly recoup and make good on those absorbed costs.
It explains a lot of why they are going for the gold here. I support them going for the gold, don't be mistaken. Quality companies who make good products deserve every reward that's coming to them.
However, if you look at the sales figures of DA:O and the reviews, you'll see that the game was widely, and rightly, praised from pretty much all angles. Why then, would they change so much? Again, logic is your friend. They have made as many changes as they can to reduce development time, which in turn reduce costs, which in turn can potentially provide huge gains for them and EA at a lower cost than the first game.
It makes huge business sense, and if I was EA, I'd be telling them to do just this. But I'm a customer, and I loved Baldur's Gate, and I loved Origins, and I'm sad that they are changing so much because honestly, there hasn't been a good party based cRPG since BG, and I'm fearful that Origins might be the last one we get.
That being said, Final Fantasy (which I also like except for IX and XIII) has had good success changing gameplay mechanics but keeping core values the same...so perhaps Bioware is going for this kind of approach. I guess we'll find out in March. That being said...XIII was really disappointing.
Oh and @Ortaya, but his green eyes and armour are so cool...