Supporting new digital cameras Raw files on Linux

This is general question about digital camera raw files. I want to know which software is responsible for rendering the thumbnails. I have Fedora and have this file /usr/share/thumbnailers/ufraw.thumbnailer that show /usr/bin/ufraw-batch but UFRaw is old last update was in 2015 according to website http://ufraw.sourceforge.net/ so other library must adding support for newest cameras, I have Nikon d750 that works fine but it was released at the end 2014. Does it mean that new cameras are not supported by UFraw and they don't show thumbnails? I'm asking this because I plan to buy point and shoot camera (Nikon **Coolpix A900**) and it's pretty new. I would like to send the raw file so someone will add support for this files. Will this camera work with Linux? I mainly use **Gnome** and **Darktable** (for the second one I can send the samples raw files and I will when I get the camera). So to sum up, my question is **how raw files are handled in Gnome based Linux distribution and how new cameras support are added** (I'm asking mainly about Fedora but general answer may be more useful to future readers)? I can't find this information, I've found this library https://www.libraw.org/ but it don't say that UFraw is using it.