Interesting.... I wonder if there is an anniversary set coming out with a Skywarp and Thundercracker toy as well, as all the other characters and artwork (in the last two images) are all being released as part of the Movie anniversary box sets.
If they did a Decepticon 5-pack (the two seekers and three Insecticons, with mid-reformatting paint decos) to go with the Autobot 5-pack, I would imagine them using the Generations Insecticons, as they just released the Gen1 Insecticons last year and they shelf-warmed badly.
(if it was the five recent Generations Legends versions, maybe it could also have the 2015 Leader Megatron as well... if it didn't look horribly out of scale to the other five)