Will all 3 games have more languages support? I hope they add Brazilian Portuguese officially.

I know there is a fan patch for Italian subtitles, but I don't think GOG is likely to get approval from Capcom to add fan content considering how anal Capcom has historically been against modding their games.

I think it's very unlikely that we're going to get an official Brazilian-Portuguese localization for these games at this point. However, it's probably possible to patch a fan made translation into the game after you change it to the Japanese version through GOG Galaxy and install the rebirth mods. I can only hope we get a PT-BR mod for the vanilla version down the line.