After just a couple of sightings in Western Australia for Blitzwing and Octone, people this week are now starting to find them at Kmart stores on the East Coast... so if your store is finally sold their Broadsides, you might finally see the fifth and final wave of Voyagers.
And anyone still looking for the Misfire wave, try Target, as new stock had shown up there for their recent toy sale.
(Slugslinger may have come and gone now though)

As for the Titanmaster, Legends and Leader class of wave 5 - fingers crossed that we see them, but with the POTP toyline expected to be released in December for Christmas, the Hasbro warehouse and Retailers would already be in a state of clearing out their Titans Return stock to make room for the launch of the new chapter.