I believe the official word on when previews will get posted is that they will be posted at Half-past-whenever-they-feel-like-it.
Despite what folks would like, I highly doubt there is a fixed timetable for that.
Oh, and regarding the assumed DD preview (and the 8th Elektra)on Friday, I expect that'll happen as well as one today. As you might recall the did a special preview on Halloween for CT, even though it wasn't on Wednesday.
The Unique version would be enough on it's own. (And there are lots of other characters who could have been done instead of the V/E/R versions)...but it does make sense, from a deranged, twisted, marketing point of view.