Looks to me we have confirmation that some form of PROWL will be happening in 2018.
See here http://usawevents.sportngin.com/events and note that there are 3 entries for Final X: Senior Freestyle World Team Trials on June 9, 16, and 23.
That would seem to jive with the idea of 4 wrestlers participating in a round robin tournament on those 3 days to get to the "Final X" who make the Senior National team.
There is also US Open: Senior Nationals in late April and Senior Freestyle World Team Trials Challenge Tournament in mid May.
I still have a lot of questions (similar to those discussed earlier in this discussion) about how exactly the 4 are chosen. For example, what if a world team member and 2 NCAA champions all want to wrestle at the same weight (along with the winners of the April/May tournaments, obviously)? Do you make the 2 NCAA champions have a wrestle off to see who gets the spot? If so, when does that happen? At the Challenge Tournament? What about the new weights with no world team member returning? Do you take the 2nd place finisher from the US Open? Or 2nd place from the challenge tournament? (Definitely need to wrestle for True Second then). And of course, how do weigh ins work for all these events? Is there any allowance? What happens if someone doesn't make weight/gets hurt?