I know Yoshi-P said "NO BLITZBALL!" but a blitzballer physical ranged class with a suite of DoTs and debuffs would be neat and would have fun and dynamic motions. There's only so many ways you can make shooting a gun or a bow look "active" but a ball that can be thrown, kicked, punched, batted, headbutted, etc. would look interesting.

As for tank, the last tank plundered the FF main character roster for material. Not sure what else could be done from there though.

Right now we have nothing to go on for any serious speculation. Yoshi-P once said that he couldn't imagine an expansion that didn't have 2 new jobs but supposedly this next one will have the gameplay overhaul too so I can imagine the devs would already have their hands full and I wouldn't surprised if we only get physical ranged. After that, everything will be more or less balanced as far as numbers go.