The main reason I don't consider Pichu the new Pikachu is because it's the Pre-evolved form of the same Pokemon. It would be like saying Magby was the new Magmar. In some ways Marill is actually more like Pikachu than Plusle, Minun, and Pachirisu. They have three forms which include a Baby Pokemon. Pikachu has an EV of 2 and so does Marill.
EDIT: We need more ice types. I want to see more focus on types we're lacking.
EDIT: We need more ice types. I want to see more focus on types we're lacking.