Chapter 153 of "Shokugeki No Soma" is already available for online reading at Manga Fox.
In this chapter Soma and the gang are going out for some recon work in order to prepare for the upcoming Survivor's Purge. Before any spoilers and predictions, here's the recap on what happened in the latest chapter.
Soma and some members of the Polar Star Dorm arrive at Venue D where crowds are already forming. Soma was again reminded that they are only there for recon mission where he readily agrees. They witness the match of Eizan and Momo vs. the Chocolate Society.
Due to Momo's expertise in Western confectionery they easily defeated the latter. Eizan is still upset over his loss against Soma and he asks Azami to let him go because of the loss. Azami declines the request since he has other plans.
Meanwhile, Azami's chosen yet unknown central chefs arrive for their shokugeki. They challenged the next society to select the theme and they will just comply in order to give them the advantage. But even with the advantage,
Central still defeats them. A chef from the Central declares that they will all eventually lose to Central. Soma and Takumi appear out of nowhere to challenge the unknown chef.
The next chapter could feature Soma in a shokugeki. However, it is possible that readers will be given a glimpse of the culinary expert Soma will have to face in the future.
At My Anime List, forum posters speculate on how the challenge would pan out as well as the possible mechanics of the upcoming competition.
The Reddit forum also discusses the future battle of Takumi against the chefs Azami personally chose for the battle.
As our characters have already been set-up, Soma will once again face challenges in the kitchen. The future chapters are going to be exciting as we'll see more Polar Star Dorm students go through shokugeki.