A G63 would certainly be rather awesome. But too low volume to make much sense from a biz perspective.
Come to think of it, a G (Geländewagen) 63 AMG would be too.
IMO, although the article mentioned chassis sharing, I have to think this has something to do with higher volume, lower displacement turbo motor of some type....something that will make the G25 less expensive and more powerful/efficient. I wonder what the next "Infiniti sound" will be?