I got my Fuji X-Pro 1 camera form Amazon two days ago and since I still have not received any of the Fuji lenses I ordered, my only choice was to try the new camera with Leica M lenses. I used Kipon L/M-FX adapter that can be purchased from eBay (check also Kipon's website here).
The Fuji X-Pro1 mirrorless camera doesn't have focus confirmation or focus peaking. The only helpfull feature if you are using manual lenses will be the zoom in the EVF. Make sure you switch to manual focusing (M) in order to enable the zoom feature (by pressing the dial on the back). I found it easier to focus when the lens is wide open (f/1.4 for example) or just use f/8 with zone focusing.
Because the X-Pro 1 will not recognize the Leica lens/adapter combo, you will have to enable "shoot without lens" option in the menu (can be found in the 3rd menu page).
You can change to the actual focal length in the camera's menu - it will be saved in the EXIF data and it can be used as a reference later on (some of my samples do not have the correct focal length because I forgot to set it):
If you are interested in using other lenses with the X-Pro1, Kipon has a whole list of adapters. Make sure the lens has a manual aperture ring - this setup will obviously not work, unless you want to shoot at f/16 all the time.
Here are few full size jpg images I took in the past two days with the Leica 28mm Elmarit and 50mm Summilux ASPH lenses on the X-Pro1. Since Adobe Lightroom 4 doesn't support X-Pro1 RAW files yet, all jpg images were taken straight from the camera with any post processing: