ESO is taking a lot of good stuff (that worked) in WoW/GW2/TSW/Tera and they are also adding a lot of unquie stuff taken from ES and some new innovations.
The character progression system got a lot of depth. I am particualry surprised that they have 16 instances X 2 (hard mode) in the game already. One good thing is people/journalist are NOT hyping the hell out of this game like the way they did for GW2. This is good because we will all have reasonable expectation at launch.
One negative force ZOS/Beth needs to fight is the bitter taste we all have from recent big name MMOs flops. The whole MMO Genre got a very bad rap from these flops.
If you search Youtube for Elder Scroll Online for last 48 hours you will see the following new informative videos. (caution: ZOS paid travel, food, room expenses for these journalist)
The Elder Scrolls Online - Synergies, Finesse, Mounts, Vampires, and more! Massively Mar 20, 2013
Elder Scrolls Online Gameplay DETAILS! First-Person, Combat, Guilds, Alliances and more! Rev3Games Mar 19, 2013
Elder Scrolls Online Interview: PvP Gamplay Detailed, 3-Way Battles, Sieges, Trebuchets, & more! Rev3Games Mar 19, 2013
Elder Scrolls Online HANDS-ON Impressions! Max Scoville's First Thoughts Rev3Games Mar 19, 2013
The Elder Scrolls Online - Preview Event #1 Maria Aliprando Interview