Confirming some of the recently added items on the RID game App, are listings for some upcoming gimmick toys at a couple of online stores.

The new figures are...

1-step wave 5 - Gold Grimlock (Gen1 colours), Patrol Mode Strongarm (mostly white)

3-step wave 4 - Sideswipe

They are listed for around June-July, but I think that is a bit optimistic as there is a wave before these that haven't been released yet.

There is a wave 6 of 1-steps listed, but doesn't appear to have any new toys in it.
Still no sign of the 1-step Optimus toy that was added to the game App before the toys above were listed.