I would suggest you use the search function before posting questions like this, because there are at least 3 other threads on this topic, to my recollection. If you look in Reinheart's translation thread you may have found what you're looking for.

Yes, Summoner is in the works, although probably not anytime soon. Yoshi said, specifically, that things will be split up as such:

- Primals such as Ifrit, Odin, Garuda, etc. Are too powerful to be allowed to summon from a particular class. However, there will be an item introduced called a 'Primal Card', of which only one per Primal will exist per world. A Free Company has the chance to earn one by defeating a Primal, and will have a period of time (probably ~2 weeks) to use it before it runs out and other Free Companies can earn it.

- Summoners will have the ability to summon lesser beings such as Carbuncle, Sylph, or Fenrir (no specific summons have been named yet, though)

- A pet/beastmaster class may be released that can call normal game mobs into its service