As detailed by @BetweenTheGoalposts in his excellent research as shared via the following link, and awful lot of special teams players from the spring leagues have made it to the NFL.
As detailed in the UFL thread, special teams play is being heavily encouraged in the UFL on both kickoffs and punts, which will look like, old school kick offs and punts.
There is a bit of mystery at hand here, beyond the naturally higher appeal of more kick returns for most fans at the stadium and at home, as to why the NFL would take any interest in having more kick returns in the UFL and not less, unlike of course as we have seen in the NFL itself on both kickoffs and punts.
The special teams play in the UFL is worthy of checking out this spring also along these lines of NFL interests.
No one is the wiser of course, but to me this is a small sign that the NFL might not change the kickoff rule this season though perhaps like most, I feel the change in kickoffs in the NFL is penciled in for this decade after the owners debate and decide exactly WHAT to change.