Joking. The information is they have lot's of information, but they're not willing to tell you. Why? Well, maybe it's sooo revolutionary that they're afraid other MMO's will steal it! (LOL!) Or maybe they really just dont have s*** to tell the players.
I'd speculate they're being secretive because they really dont have anything new or worth talking about beyond the bulletins they have on the buy page.
Beyond that, they're trying to give the RotHC a sense of mystery, in hopes that people will buy it before they realize how little they will be getting. This strategy also works with Cartel Packs. You dont know what you will get, but you have hopes for what you will get. This same mentality/strategy is working to get some people to buy this "expansion" as well. And some people actually are gullible enough to fall for it.
Is this what they're playing off of? The mystery? Am I wrong? Why does BioWare actually think this is a good idea? Discuss.