Board Thread:General Discussions/@comment-1030114-20140726200851/@comment-3367060-20140813045607

ProvenBeat wrote: Who said that they all will be in the second movie? ...Legendary did. They said Rodan, Mothra AND King Ghidorah will be appearing in Godzilla 2, and they showed teaser footage of them already. Extremely unlikely they're going to show teaser footage for Godzilla 3 at the same time as Godzilla 2.

Then Legendary said that "Joining Godzilla in future franchise installments are other classic Toho monsters," so there's probably going to be more than just these three returning. *coughcoughMECHAGODZILLAcoughcough*