These tier changes were really a mixed bag, mostly positive I find but some, like the lack of steels in NU, are scary. Swellow + Sawk = dominate. Golem up, Regirock up, Alomomola up.
Anyways, One of the most interesting changes I have seen in Mamoswine moving up. I know why Duggy moved up, I know why Alakazam moved up, I can even see Jolteon and Donphan moving up, but why Mamo? Don't get me wrong, its a good poke, but I don't really see its current niche.
Also, one last thing. Cress and Sigilyph in RU... *shudder*