Spanish yes, Italian no.
Spanish is spoken all around the world and the markets in the countries in which Spanish is the main language are growing.
It's a more and more important language in the US as well, one of SE's biggest markets.
If another language is added to FFXIV it should be Spanish.

I'm generally not in favor of adding many new languages though because it will just make everything take much much longer because of the localization. The reason why German and French are already used is because they have always been traditionally good markets for games in general (and therefore SE's products too, obviously). Italy...not so much.
Italian is not spoken a lot outside of Italy either so I don't think it makes any sense to have an Italian version of FFXIV.