It's great to hear more people are finding the blind bags now!
I do not know if there is a pink Twilight Sparkle in the US release, as I am not from your country however I can tell you that the mane six should be the same in all three waves except for their cards. The special editions of the mane six only differ in details (sparkles or glow in the dark), not in pose or sculpt.
I can't tell you anything about wave 4 as I haven't seen any pictures or the ponies in real life. If anyone does have pictures, please contact me, I'm dying to know what they look like! >3<