With Optimus and Megatron sets just released in Japan, speculation is already brewing on future sets... as in, if there are more, who will they be?

Apparently, on the inner flaps of the packaging of the first two sets, are possible hints on future sets.
On the Optimus set, there are pics of G1 & Movie Bumblebee, plus G1 & Movie Ratchet.
While on the Megatron set, there are pics of G1 & Movie Starscream, plus... and this is the interesting bit... G1 & Movie Shockwave.

If this really is suggesting that those are the next four sets, could we really be seeing a Gen1 Shockwave reissue, after all these years?

Kinda exciting actually.