The X-t3 firmware, available in December, among other things will bring 4K HDR recording in Hybrid Log Gamma (HLG). HLG footage should simplify the capture of HDR content and should improve post-production capabilities.
The X-U1 firmware, also available next month, will improved image stabilization. Fujifilm says in-body image stabilization will now work better with optical image stabilization in lenses to improve overall stability.
The flagship GFX 50s firmware available later this month will add support for a new 35mm Format Mode when using GF- and H-mount adapters,
Stay tuned to Fuji for more info and download archives.