Sonic Boom + The New Sonic Cast?

I don't really mind Sonic having blue arms and legs. In fact, it never really made sense to me as to why they haven't been that way from the start. What does confuse me, however, is how Amy gets to keep her original arm-color, but Sonic doesn't. Or am I just seeing things? The new designs aren't too bad for a one off. We needed a breath of fresh air by this point anyway, and rumor has it that the designs will only be used for Boom, so I think it'll all turn out well in the end.