There isn't much surprise that it has been delayed. I think people have been expecting that for some time given just how little detail has been coming out. If they had been aiming for this year then they had a stack of information to showcase and very little time left - still have 5 factions (Cathay, 3 more monogods and Chaos undivided) plus pre-order race plus maps, sieges etc to showcase.
Hopefully we get something soon though in terms of news. We are already halfway through September.