So it looks like the KLM flights to DFW are still slated to operate.
An internal KL source has confirmed that these flights will continue to operate for the summer season, however, due to aircraft scheduling will not commence until May, one month later than originally planned. It is possible, depending on forward bookings that the schedule be extended again to year round, but at present, and most likely, will remain at seasonal.
According to the schedules for the first flight resumes on 02MAY12 KL669/670 the AMS-DFW-AMS rotation.
Of course, we have already discussed how the AMS-MIA rotation is being cancelled, and that IAH is being reduced to one daily, with the cancellation of the A332 on the second frequency, and previous cancellation of the PrivatAir BBJ.