No such thing was ever said.
In an interview, producer Tomiyama said there had been a break of 9 years between TERROR OF MECHAGODZILLA and GODZILLA (1984), and it would probably be about the same again this time. His words were taken too literally and everyone began saying there would be a new Godzilla movie in 2013.
I think it will be a while yet before Toho bother with another Godzilla movie. There is really no demand.
Producer / Editor