Fuji seems to have snuck a 28mm conversion lens in under the rug for X100 owners for whom 35mm just wasn't quite cutting it:
FUJIFILM Wide Conversion Lens WCL-X100 | FUJIFILM X Accessories
And firmware 1.30 to work with it, plus a couple of other small fixes:
Firmware for FinePix X100 | Fujifilm Global
This lens leaves me with very mixed feelings. If they'd come out with it before I bought the X-Pro 1, I might have saved a boatload of money. OTOH, I might not have the X-Pro 1 now either. I'm happy with where I am but might have been very close to as happy if I could have used my X100 at a 28mm FOV...