Well known witter account @evleaks presented supposedly new Moto G model. As rumors say, it's supposed to be a improved Moto G designed for Latin America Market.
Moto G FORTE
As the name suggests, the phone is supposed to be stronger than it's predecessor. It's possible that like Moto Defy, the Forte will be water and dust resistant. Also many rumors add that in the new Moto G shall be equipped with microSD slot, which lacked in the classic Moto G.
More official informations should appear in couple of months.