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For those who wonder if these are zones completely closed off based on your level, they aren't. In this video, a player walks from Grahtwood as a level 9 all the way to Repear's March and does some exploration on the way. Yes you won't be able to fight everywhere, but you will be able to explore to some degree. Crafters might even love the challenge. Is it like the single player games? No..which I prefer, because I hate when things level up with you which is exactly why I heavily Modded Oblivion...in order to make it feel more like an MMO as I prefer leveled areas. Skyrim did a much better job at not leveling up everything as you level. I'll be curious how Dragon Age handles this. Can't wait for that game :-).
Even though I'm taking a break to play Divinity Original Sin and while they rework the Veteran areas, I still think ESO is the best exploration based MMO as:
1) It is NOT quest hub centric. Many quests are obtained through exploring in non city areas and in dungeons.
2) In addition to exploring for lorebooks and skyshards, you will miss out on locations and lore, many of which can be placed on your map by talking with NPCs that DO NOT have quest markers over their heads.
Could they have made it even more open world? Absolutely. However, it is still better exploration wise than other MMOs out there that are PVE centric.
There Is Always Hope!