Board Thread:Dark Souls II/@comment-5264386-20131018105419/@comment-5264386-20131018105707

Archery and Upgrading Mechanics (August 1st, 2013)
Apparently, we will be able to permanently combine two different elements together, as a pose to being restricted to one upgrade path (like in DaS). So, for example, we could add a poison status to a fire weapon, or add a damage-enhancing effect to a normal weapon. This will be achieved through using selected items which the player finds in their travels.

A previous thread on DaSII's archery mechanics, as well as other things, can be found here.