A game that big wants a big audience. Even if it were in a fit state to be shown off (which, knowing Bethesda, it won't be), they want to wait until the X1/PS4 audience is large enough for it to make sense showing off.
I think E3 2015 reveal, coming out late 2015/early 2016.
I'll pick it up late 2016, when some of the worst bugs may have been patched. (Not that there won't still be a few dozen game breakers in there!)







