A photograph of what may be an internal BMW computer document posted to a BMW enthusiast forum shows the BMW 1-Series M Coupe is indeed coming to the U.S. and that it will sport up to 332 kW (445 horsepower) when it does. Very juicy, though we're hesitant to call it confirmed since that would put the 1-Series M Coupe well into M3 territory.
The other parts of the screen show a European version of the 1-Series M Coupe (allegedly codenamed "Pyrat" in the leaked document image) rated at 250 kW, or 335 horsepower. That figure is right in line with the N54 output found in the current 335is and Z4sDrive35is models.
Looking farther up the chart, we see the 1-Series may get its own 135is model, as well, rated at 306 horsepower, meaning it will likely be a suspension/appearance treatment only.
Take this as you will, with as much salt as needed to be palatable, but it certainly looks the part of good leaked info. Hit the link to see the image for yourself.