core rules do state that you can fight with any weapon that is wooden and has ironwood cast on it. I have a druid that used an ironwood bastard sword which was a +1 weapon.
True, ironwood provides a specific exception. Weapons made of ironwood may are "freely usable" by druids according to the spell. So the elven druid in question could use an ironwood bow.
No, it wasn't. I just checked the phb clarifications, corrections, along with the faq. No such clarification is in existance - or perhaps you'd like to supply the reference?