The version of Adobe Camera RAW is 8.4, that is also what is in the current Adobe Lightroom V5.4.
The release candidate for Camera RAW 8.5 has bean announced and one thing that did catch my eye was a comment about the Fuji X-T1.
Fixed issue with Fujifilm X-T1 raw images appearing too bright at high ISO settings when using Dynamic Range 200% and 400%. Unfortunately, this fix may affect the appearance of existing images captured with this combination of settings. It is recommended that you (1) purge the Camera Raw cache via the Camera Raw Preferences dialog, and (2) review images shot at ISO settings higher than 1600 for unexpected brightness changes.
So when it’s released watch out if you have any images shot at high ISO and are using the Dynamic Range Options.