The Fuji x100 camera will have a flash commander mode - "The Fuji Guys" just confirmed this on twitter:
The rumor coming out of CES is that the Fuji x100 will be compatible with Nikon's CLS (Creative Lighting System).
Fuji x100 is priced at $1,199.00 at Adorama and they just started taking pre-orders.
Nikon and Fuji have worked together in the past (see FujiFilm FinePix S5 Pro which was based on the Nikon D200). The contact points on the x100's hot shoe are different compared to Nikon's - probably because Fuji wants to sell their own new flash units:
Here are all Fuji x100 related posts from PhotoRumors.