https://www.fujirumors.com/ have published some info about the upcoming standard prime for the system - the 33mm f/1.4. Looks like, compared to the fantastic existing 35/1.4 it will be bigger (58mm thread), weather sealed and priced at $799, which is less than I had expected given the price of the recent 18/1.4, but I suppose it's an easier lens to design. Official announcement, along with a few other things I'm lead to believe, on September the 2nd.
I'm really looking forward to seeing how it performs compared to the older lens. It would really have to be something special though.