And I can see others thinking the same way, would Fuji present
their own body designed DSLR with different lens mount options?
The only logical reason to do that would be if you thought that you had something that competed at the very top end, as Kodak thought with the SLR/n and SLR/c. However, with the 5D in Canon's lineup, I think it would be darned difficult for Fujifilm to siphon off Canon customers in any quantity with anything less than a FF > 12mp body at a competitive price.
Despite the apparent cosy relationship with Nikon in the past
perhaps Fuji have been held back from the higher performing Nikon
bodies
There is no evidence of that assertion. Nikon has sold virtually every body they make to someone at some point. The evidence suggests that Fujifilm and Kodak picked the N80 body for cost purposes.
if they made significant improvements
on the sluggish S3 features
Also no evidence that they've put any engineering resources into this. The S3 isn't any faster than an S2 in throughput, and the S2 wasn't very much faster than an S1.
It is something I have wondered about before but everyone seems to
always assume it would be another Nikon body.
That assumption comes from a simple fact: ALL current Fujifilm DSLR users have Nikon mount lenses and accessories. Every last one of them. Thus, if you want to retain your current customers, you'd better have a Nikon mount body. Further, Nikon has pushed lots of new technology into their bodies (AF, metering, flash, etc.), so you can't risk falling behind on that or you lose your current customers to future Nikon bodies.
Now, if you don't care about your current customers much, you go your own way, sure. Perhaps you drop them a bone with a Nikon mount body that comes from somewhere else. But that body better have state-of-the-art AF, metering, flash, etc. So where does that body come from?
Maybe that's why they have kept the details so secret for so long,
Each new Fujifilm DSLR has taken longer to produce than the last. That argues to insufficient engineering resources. Further, this time around, if Fujifilm continues to use Nikon bodies, they would have had to re-engineer their body work, too. The delay can be explained by historic observation.
--
Thom Hogan
author, Nikon Field Guide & Nikon Flash Guide
editor, Nikon DSLR Report
author, Complete Guides: D50, D70, D100, D200, D1 series, D2h, D2x, S2 Pro
http://www.bythom.com