There's 4 classes shown here but there will be around 20 to choose from. I'm also hoping there will be character customization for things like face/skin/hair/height. Character create is one of my favourite game features, as I love to make something that suits my personal aesthetics. Collecting cool new armor and weapons is also a fun way to upgrade your characters look, so I'm hoping these features will be included too. Given the nature of the game, I'd say it's a pretty good chance that these features will be available.
There's a little bit of information in English is over on Final Fantasy Wiki. This game has not been officially been announced for an English release but it's very early days, so sit tight! However the Japanese release has been set for Winter this year, which probably means a Christmas release. (That's summertime for those of us in Australia!)