So there is this: https://www.facebook.com/ThrustmasterOfficial/videos/1256881461108201/
Not going to grab screenshots from that brief video but I feel that Thrustmaster is sticking with the Warthog for the next few years.
At their last event (New York - APril 2016) it was noted that they had a 10 year lifecycle plan for the Warthog … which would take us to 2020 for a new 1st class stick/throttle combo.
EDIT: There are still persistent rumours of a couple of unveiling at E3. Patience is best