Coming soon in the 4.06 patch will be the fifth season of The Feast and the first regular season after the Stormblood PvP redesign.

For those who are in the top 100, you will earn a new armor set.

The blog post makes it sound like finishing in the top 100 is the only way to earn the armor. You will not be able to buy the armor set with tickets...

Ticket Rewards

They are also adding other rewards this season, such as weapons.

The Feast rewards, such as the weapons, will be purchasable with tickets and the amount of tickets you earn will depend on the tier you reach (Silver, Gold, etc). The higher the tier, the more tickets you earn.

As a bonus for those who finish in the top 10, they will earn enough tickets to purchase a weapon outright during season 1's competion.

The initial blog post is in French, but with Google translate give it a read.

Update Aug. 2, 2017 8:30pm: