I believe I read that the rules people suggested moving the kickoff another 5 yards closer (which doesn't mean the NFL will pass it). If passed I think most kickoffs will go out of the end zone and you don't really have to worry about a kick off returner (and I'm hoping one of the WR/RB will solve that, maybe RB Harris or RB Franklin?)
And the best two pun return averages from last year (of those with at least 3 pun returns were)
1)WR Jeremy Ross
2) WR Tandon Doss
I think we all know about Ross so I'm not going to get into that...
In 2013 Ravens cut Doss, and Packers brought him in for a visit/workout and didn't sign him. Ravens resigned him... and he was a FA this off-season and signed for two-year, $1.505 million contract (less than a million a year). If the Packers wanted a cheap good punt returner (that's bad on offense) they could of had one of the best.
And also for kick returner S Quintin Demps had one of the best kick return averages last year and he's been a very good #3 vet Safety and stop gap starter if they wanted one. He signed but it hasn't been released how much yet (I don't think).