So, the reveal of the new expansion is just a month away. Although the most we will learn regarding new jobs will likely just be another T-shirt, but discusssions are already underway about the possibilities.
After looking at wishlists, hints, arguments for and against possible future expansion settings, and thread titles 3 names came up top. Samurai, Red Mage, and Dancer. Sounds like a pretty good trio.
Now assuming that these are indeed the new jobs. And assuming further that each will have a different role, what will those roles be?

The easiest and most likely answer is:
Samurai as a tank. (Based on parry probably)
Red Mage as a our first sword wielding DPS
And Dancer as a healer

The least likely and pretty much impossible is:
Samurai as a healer
Red Mage as a tank
And Dancer as DPS

This version gives each the only role they can't possibly be good at.

My personal favorite is:
Samurai as a DPS
Red Mage as a healer
Dancer as a tank (based on dodge)

Red Mage might sound like a dumb choice for healer, but RM has always been a support class and they do have a buch of white magic spell to heal.

The full list of choices are:
Samurai tank, Red Mage dps, Dancer healer
Samurai tank, Red Mage healer, Dancer dps
Samurai healer, Red Mage dps, Dancer tank
Samurai healer, Red Mage tank, Dancer dps
Samurai dps, Red Mage tank, Dancer healer
Samurai dps, Red Mage healer, Dancer tank


Which of these choices would you prefer? (For bonus points: how likely do you think your choice is?)