On May 11th, Fuji announced a free firmware updates for some of their X-T1 cameras. The new firmware is only available for the FUJIFILM X-T1 and X-T1 Graphite Silver Edition devices. They do not mention security fixes, only new features. The last update was 3.00, released in December 2014.
More information:
http://www.fujifilm.com/news/n150511.html
http://www.fujifilm.com/x-t1/ver4/