No Fluttershy, Cheerilee or Lily Blossom D: At least you guys are getting some at any rate. Better than nothing, I guess.
Or Apple Jack it looks like.
Why only 4 of the 8 ponies?
It is probably cheaper to manufacture a smaller selection: let production lines or die swaps need to be run.
If shipping isn't terrible, you might hit the trade forum and swap for those you aren't getting. I know I could use a few more Pinkie Pies and Twilight Sparkles in exchange for spare Cheerilees I have.