The actual quotes from the slideshow in the keynote, grouped by relatedness:
"Role: DPS (Ranged DPS)"

"Ranged attacks using magic"
"Melee attacks using rapier"
"A hybrid ranged/melee style achieved via high-speed positioning"
"Deal massive damage by linking multiple spells with chainspell and following them up with with melee attacks."

"Red magic = Black & white magic hybrid."
There's two ways in which they use the term hybrid.

First is that they're primarily a ranged dps job that casts spells at a distance, however they will hybridize this with melee attacks via 'teleporting' abilities. My guess is that the teleporting abilities will be baked into the massive damage combo. I.e. in order to achieve the burst effect you actually have to use the positional change ability. E.g. each step in this combo has to be successfully completed to reach the end of the combo in which most of the potency is loaded into the final ability: Spell 1 --> Spell 2 --> Spell 3 --> gap closer+damage ---> Melee attack --> leap back+damage --> High potency spell 4. I.e. Effectively a ranged caster that jumps into and out of melee occasionally to be able to unlock their burst damage. Note that the combo I outlined appears to be what the video example shows.

The second way they use the term 'hybrid' is when talking about magic. I suspect this will be a more literal hybridization of white and black rather than saying that they'll use white magic and black magic as separate entities. I.e. they're warlocks who have figured out a way to mix both black and white magical energy into a single spell at a time.

They don't ever use 'hybrid' to mean the traditional MMO definition of being able to fill more than one role in a party. I.e. they're not able to be both a healer and a dps for example.