I finished recurrent last week and no mention of the DFW base was made.
However, in talking with two people whom I believe to be reliable, DFW ops will expand with 15 airplanes based at DFW. However, this will happen before there is a DFW crew base.
One of the people I talked with mentioned the 70-seaters will go to DFW because of the possible return to Mexico flying. With LE flaps and B model engines, that airplane will do well in places like Mexico City.
Fly safe!