The Nissanites of the Infiniti tribe will show off a new coupe concept at the Detroit show in January, Edmunds Inside Line is reporting. Will it be an offshoot of the GT-R Proto Nissan showed in Tokyo? It sounds like it may be, considering the company has been vague about whether the new super coupe will be branded in the US as a Nissan or Infiniti product. All we know for sure is that it'll have not have a V8. Both the G35 coupe and its sedan sibling are due for a nip/tuck in 2007, and Nissan sources also told Edmunds the new sedan will break cover at the New York show in 2006.