Council of Glades, grammatically, is a council pertaining to any and all glades ever. That makes no sense unless it's referring to something we don't know of yet, whereas Council of the Glades has precedence in existing lore (Council of Tirisfal) and is obviously referring to Tirisfal Glades. Odd.
If this is legit, I actually really like this title! I haven't been able to say that since Wrath of the Lich King
World of Warcraft: Council of the Glades
That's awesome.