According to Photography BLOG, Fujifilm will display a prototype of a new medium format camera at PMA this year (the Photo Marketing Association trade show), which runs from 31 Jan – 2 Feb, 2008. They say that “details … are scarce at the moment, so we’ll try and get more info for you next week at PMA”. Stay tuned!
Some more informations: http://www.letsgodigital.org/en/18141/fujifilm-medium-format-camera/