"A champion's role roughly defines the type of value they contribute to a team, or else communicates the fundamentals of their playstyle. It sets expectations for what a player's experience will be like and what they can do for their team. At Riot, we see a champion's place in the game as some combination of primary and secondary roles from the following list."
With that said, we're not sure if the names will be sticking, but Riot will most likely have their casters attempt to utilize these new names as an investment to a less confused audience in the future. Some of the more common changes are as follows:
AP => Mage
Bruiser => Fighter
ADC => Marksman
A full list of the changes can be found here as well as an explanation as to why they are going through with the name changes in the ever-involving metagame that we experience and why they feel this is necessary.
Source - Riot Games
