Gundam HMS Selection 3 is due in August, and this round features a G-Sky and G-Bull, each with Gundam parts, that can gattai in the usual ways.
There's also a CharaRail set coming for Magiranger in August. Parts of the train gattai to form the third Magiranger robot. There is a strong rumor that a "Magi Train" is coming in the Magiranger lineup -- perhaps this is a tie-in.