Obligatory disclaimer, yes I know it's datamined stuff without much context, etc etc. Basing feedback off assumptions and none of this may actually be applicable as things get hooked up.
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MMO-champ's datamining revealed PvP-tiers for 2's, 3's, and RBGs that are set ratings attached to the existing PvP titles. It's unclear whether or not these are going to replace or be awarded alongside the current method of awarding seasonal titles.

Personally, I'm not a fan - the competitive ladder has awarded the top X% of players with their appropriate titles and due to that system, ratings to achieve those rewards fluctuate throughout the season as more and more players fight and the better players rise.

The thrill of competition and pride in achieving "top X%" suffers when you are given set goalposts. It becomes less about being among the top and more about pushing until you reach the threshold you're happy with and sitting.

I believe Elite sets already serve the guaranteed, nonfluctuating reward need already, at least how it was handled in Legion. Achieving 2k guarantees you a set of unique armor once the gear set rotates out, regardless of all other factors in the ladder, and those who want to continue to push for glory have that option.

If anything, I believe there should be another 1-2 reward thresholds for the lower end of the bracket, because it's hard to tell someone that they get nothing worthwhile for their time unless they are among the best capable of reaching 2k or higher. A seasonal "Challenger" title isn't very compelling; there needs to be tangible rewards earlier to encourage participation at the low end. This, in turn, could bring people interested but otherwise unmotivated to try to improve their skill into the pool of arena regulars, so that they too might see themselves among the higher tiers one day.

It's very hard to convince someone to spend hours and hours of time researching, practicing, and enduring the frustrations of learning how to PvP when they won't have anything to show for it unless they're among the best... 20% I think is about what the 2k ratings are at for Elite gear? Slap on a seasonal pet or something at the 1650-1700 area and the average player will have a reasonable goal to strive for, with enough commitment involved to decide if arenas are right for them going forward.

ALL THIS ASIDE, if the system is going to replace the current title distribution system, please re-evaluate the rating requirements.

Unranked: 0 - 1400
Combatant: 1375 - 1600
Challenger: 1575 - 1800
Rival: 1775 - 2100
Duelist: 2075 - 2400
Gladiator: 2375+

Rival starting at 1800 is extremely low, as the cutoff recently has been upwards of 1900-2000 and thus Duelist is also too low. I'm of the opinion that 1550 should be the starting point for rewards. It's the very first rating achievement you get, even!