Just in the last few days Adobe released version 5.4 of Lightroom. This version gives some additional functionality when processing Fuji X RAW files, which I will get to in a moment.
As far as I am aware Adobe haven't changed how LR handles the demosaicing but I think it's already pretty good now, not perfect by a long shot, but pretty good. I'd love to see version 5.5 step up another level on this issue.
The additional functionality is the addition of being able to select the film profiles that we are used to seeing within the Fuji X Cameras, the Vevlia, Astia, Mono settings etc. They're not a perfect match for what you see on the Fuji JPGs, but it is a really good start.
My video here uses the Astia profile and then goes on to process from there.
I hope this is useful to you.