From the one hand, professional reviewers have mentioned that, from what they have seen, the game is nowhere near ready for release and that they do not actually expect ESO to be released until 2014 (sorry, dont have links right now, hopefully somone else can post them).
On the other hand, with Beta announced, one would expect ESO to be release in 6 months or less.
For now, I am going to put my money for Holidays 2013 (i.e. around December).
When do you think ESO will release?? Take a guesstimate!