@Kouta15875969 on Twitter posted an awesome custom, a Biollante Whale. He looks to have used the basic premise behind Biollante's creation and added in to that a whale, and it actually works really well. The custom features a light up stomach area much like the regular version of Biollante, he also give it an opened and close jaw versions and a ship for it to bite. The custom is unpainted at the moment but he plans on painting it down the line, check out this awesome custom below.
Rumors and a mysterious Twitter post from Legendary have something Godzilla orientated coming out of SDCC in the mean time here is some awesome artwork.