Yes
There is, finally!
Yes, very simple search returns "Connect with free Wi-Fi, provided by AT&T. We understand that when traveling, it's important to stay connected. That's why we've provided free Wi-Fi in all terminals, parking garages and gate accessible areas for all DFW customers. Our free Wi-Fi service is provided by AT&T and is available at no charge." Easy!
I can't speak for all terminals, but there WAS free wifi at Terminal A. There were also little charging countertops with plugs for electronic devices.
Thanks! Your answer is awaiting moderation.