There was a time in the 1970s when pyramid power was a big deal. People would construct or buy little pyramid structures to sit in and meditate or masturbate or something or other to bring them more power. That sort of happiness is parodied to some extent in a Seinfeld episode in which a natural "healer" or holistic practitioner treats George for tonsillitis by having him drink some concoction while sitting under a pyramid shape (the pyramid comes in around the 3:16 mark).
Meiji obviously wants to get a piece of that pyramid power and have created a variation on the Meltykiss/Meltyblend that has a different shape. Cubes are fine, but pyramids are that much better. They also appear to be better for Meiji's bottom line as this box of chocolates cost $6. Usually, Meltykiss/Meltyblend are around $4. I'm not sure what the big boost in cost is all about, but I will have to live without the power of pyramid-shaped chocolate at that price.