I think they not are going to tell us

At least, not until the imminent release, and it is still not going to be anything specific even if they are. This is understandable for a couple of reasons. First, such things rarely arrive on time. As you may remember, PD 3.0 had been postponed for almost a year or so, and eventually it became an object of numerous jokes all over the forum (like was going to occur sooner than PD 3.0 released)

And then, an early announcement will take away the element of surprise and interest toward the site. Vague and non-specific hints work better in this regard. A viral campaign would get you even further in stirring up interest and agitation (like many in the film and game industries are doing nowadays)