http://www.gamersector.com/previews-and-reviews/another-skyrim-update-on-combat
"To reflect this improvement, arrows will become more expensive and a lot less common."
"Lot less common" meaning rare. Or rarer, at least. Every piece of information regarding archery has brought up the fact that arrows are going to be much less common. And if they are that much harder to come by, I think using a bunch of them hoping to hit a bird out of the air falls well into the "cost" portion of a cost / benefit consideration.
"A lot less common" does in no way explicitly mean that they will be rare. That would mean that only one in ten shops which sold weapons would sell enemies, and only very occasionally would an enemy be armed with a bow and arrow. I personally think that quantities found on enemies and in merchant chests will be significantly changed.
Don't forget, that in an article describing dragon combat, they explicitly stated that a dragon needs to be shot out of the sky by arrows or ranged magic. If it's possible that the Dovahkiin might NOT run across enough arrows to be able to use in combat against a dragon, then dragon slaying wouldn't be possible unless the Dovahkiin used magic. At high levels, for a non-magic using Dovahkiin, fighting high level dragons, that would be disastrous.