Taken from this dpreview thread:
"Have had my X100 for a week now ... puts any of the 4/3 compacts out their to shame. Pretty sure they have a winner here...and Fuji has confirmed an X300 next year that will have interchangeable lenses."
"I'm in the pro photo supply biz...this is from Fuji. They have decided to pursue what they call the serious prosumer market. The plans are that in the fall they will release an X200...a simplified 'p&s' version of the x100. If these cameras do well they plan on the interchangeable lens version sometime next year."
Maybe this is related to an earlier message from Fuji on Twitter? How about this tweet from yesterday: