Thanks to Bruno at MMPRToys, we now know that the next releases from Shout Factory will be Jetman & Gaoranger!
Jetman was the Super Sentai season before Zyuranger which eventually became MMPR and Gaoranger became Power Rangers Wild Force in the states!
Jetman will be released September 25th, 2018 and Gaoranger will be released sometime in December 2018.