Final Fantasy XIV has a handful of announced classes ranging from your basic fighter (aka gladiator) to crafting specialists such as the blacksmith and alchemist.
Summoners, a staple of the Final Fantasy series, aren’t on the list, but summon monsters will play a key role in the game’s story. "Currently, there is no summoner class, but avatars (summons) will have a key role in the story, and there are several plotlines surrounding these beasts,” said Hiromichi Tanaka, Executive Producer, in a fan-powered Q&A session.
While summoners are out, the developers plan to roll out Final Fantasy XIV classes even after the game launches, “There will be more classes announced after the service starts. For the beta version, there will be a level cap, and there will also be a level cap at the start of the service.”