Fujifilm is rumored to release a new Fujinon GF 56mm f/5.6 R WR lens soon:
"Fujifilm will release a Fujinon GF56mm f/5.6 R WR soon. Possibly along with the new GFX that we know is coming and it is my belief that this lens will be a more affordable compact Fujifilm GF 50mm f/3.5 R LM WR. The GF 50mm f/3.5 R LM WR is a great compact lens, but Fujifilm could build a true pancake lens with the above specs."
Via FujiAddict