A brand new Fuji patent (JP2013/004636 published on 02/27/2014) describes a rather spectacular new 85-300mm f/2.7-3.7 XF zoom! It's terrific fast for such a zoom range!
These could be the characteristics of the "Super Telephoto zoom lens" pictured on the official Fuji roadmap:
Obviously, the real production lens could have slightly different specs than the patented version. But would you buy a lens like that? I guess it will not be cheap! But it will suite fine on your new Fuji X-T1 which by the way keeps selling wonderfully according to Amazon US (click here to see the ranking).