What defines "Everquest"?
To me EQ is a massively multiplayer online role playing game that is set on the planet of Norrath. It features races such as Humans, Elves, Gnomes, Trolls, Ogres and Iksar. There is a history in which the Ring of Scale, Shissar, Combine Empire, Venril Sathir, etc. play major roles and where Gods and different Planes are a major influence.
Nothing in my worldview discredits a game with destructible environments, multiclassing, or Rally Calls from being "Everquest". Indeed when I played EQ I was very keen on the ways in which the world was effected by long term change. There were hints with things like Paineel emerging and the Hole being discovered or the opening up of Kunark and Velious...but these were all just expansions and the rest of the world stayed depressingly static and made it seem less real. To that extent I would think the promise of Real Change and constant evolution would make a game MORE like Everquest than not.
Now of course a great many things depend on the actual implementation of their ideas, but even I can see many ways in which the skeleton they have outlined can become a VERY revolutionary title and reinvigorate the whole MMORPG genre. Certainly what they have sketched sounds more like a place to go and want to be rather than a game I boot up just so I can sit in town waiting for the evening's raid.