They'll have to release Poser 7 pretty soon, as with the Christmas post and people going away for Christmas we'll be stuffed if the preorders comes while we are away. Plus I remember all the problems that people in the US had with delivery drivers putting notes through the door saying no-one was in, without even ringing the doorbell to see if anyone was. 
In Britain our copies (Poser 5 or 6, can't remember which) were delayed for weeks coming from Ireland, don't know why. At the time there was a thread on this board suggesting that leprechauns were trying to get across the sea in a rowboat piled up with Poser boxes. All I can say is that this time I hope they use Santas elves instead!!!
As for V4, M4 etc, I think that they will wait until the fuss from P7 dies down a bit, so they can say "hey look at these great new figures" to anyone who may be dissappointed by the standard P7 ones.

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches