Sabrblade had the following to say about these possible releases:
The leftmost one is based on Fox Kids Transmetal Waspinator (thus making him a dead ringer for Shattered Glass Waspinator).
The second-left one is based on the unreleased Universe (2003) "Halloween Horrorcon Value Pack" Waspinator.
The two on the right, however, have decos that aren't as obvious.
these Waspinators might all be Waruder mechs for the pilots, with the black paint on each of their backs supposedly representing cockpits.
The only counter I can see to this suggestion is that the Diaclone line didn't have any Waruder mech toys in any of these decos, but it's still possible that these could be a new kind of Waruder mech.
EDIT: Now the theory includes the suggestion of the red Waspy being based on this - http://www.robot-japan.com/gallery/item/warudaros-3.html
Also, a closer look at the four reveals that they're missing their robot mode heads (see the empty cavity behind each's beast mode head).