I'm guessing that the exclusivity deal with Panasonic precludes advertising for the stand-alone disc until the exclusivity deal is over as that would reduce the value of the exclusivity deal during the period which it is in force.
In other words, I don't think anyone's going to buy the Panny over another model just because they can send away for the Avatar3D disc (6-8 week wait, I presume?) when they know for sure that they can just buy the disc (and hopefully, it will be the extended version for the 3D general retail release) in 4 weeks. So I would presume there is an advertising blackout in effect till the Panny exclusivity deal expires.
Getting ready for the jump into full-on theater build