This is from the recently translated German review, thanks to Shinjipl for posting the link here.
"Bonfires can be leveled up from the beginning to give you more Estus flasks or you can throw in items that make the enemies in the area tougher. Great for grinding, bad for farming items because the enemies only re-spawn a certain number of times. "
Could this be the info we've been waiting for? Everyone was worried about limited enemy respawns that have been mentioned.
Perhaps it is only the Bonfire Ascetic enemies that have limited respawn? That would make a lot of sense and would ease my fears about them.