Heroes!
Our Baron Jeremy von Crawford answers to march questions with explosive revelation about druids and metal armors.
other quetions:

• Bonus action spellcasting
• Dispel Magic against Vampire Charm
• Dispel Magic and Antimagicfield against Animate Dead
• Can Dispel Magic stop another spell effect?
• Can you use a shield with Mage Armor?

All answers here:
http://dnd.wizards.com/articles/features/rules-answers-march-2016

or download the updated Sage advice official document here

http://media.wizards.com/2016/downloads/DND/SA_Compendium.pdf

and remember
“Sage Advice doesn’t trump the rulings of a Dungeon Master; the answers and information provided here are meant to assist a DM in adjudicating the game.” JC