There's more to speculate, sure, but that's also because there's less actual news. If speculation were the golden standard, we should have a forum for The Inhumans. There's TONS to speculate there, even whether or not there'll be a film!
Ant-Man not only has been announced with a definite release date, and known creative team, test footage and substantial casting rumors, but it's got test footage, and controversy about him not being in Avengers or whatever. It's a long time coming, but it's something concrete. Defenders is currently where Ant-Man was 7 years ago, and it may take just as long to come to fruition.