We have all frequently encountered wing icing at speeds in excess of 250kts.
The wing may be kinetically heated: heating is about 8 degrees per 100kts (I think). Don't forget that over the leading edge of the wing a drop in local static pressure causes a drop in temperature too - all this means than even at high speeds, flight through moisture even at relatively high Total Air Temperature (i.e. above freezing) can still cause ice to form.
I refer you to Turin\'s answer!