"Dragon Ball Super" easily became one of the most popular anime TV series today as it features some of the greatest warriors in the Dragon Ball Universe while introducing some very interesting characters.
The introduction of a different universe has made the series even more interesting because it practically creates a whole new set of characters akin to the current setting of the anime.
As of this writing, the latest episode for DBS is episode 30 where Vegeta and Goku briefed Krillin on the events leading to the tournament. The episode also revealed various reasons why some powerful warriors can't be participants.
According to Dragon Ball Infinity, Goten and Trunks can't be part of the tournament because fusion is not allowed which means Gotenks can't participate. Gohan, on the other hand, has been training with Piccolo but could not make it in time due to some conference. Even Uub was mentioned briefly in the episode but he's too young at the time to be part of the battle.
User Gokitaaf posted at Imgur the plot summary for the upcoming episodes. The story on episode 31 will focus on Bulma who travels with Jaco in their quest to get more information about the Super Dragon Balls. The image also reveals the release dates of the upcoming episodes. Based on the image, a new episode will be released every week.
(Warning: Spoilers)
The manga companion of the anime reveals that Bulma would actually find Zuno. However, she was unsuccessful in asking the right questions which give them only limited answers. Despite the pleas (and kisses) Zuno declines to give more information.
Bulma might have been trying to locate the 7th Super Dragon Ball so that she could intervene with the tournament or use it as a contingency measure in case something would happen to earth especially when Universe 6 wins.
The upcoming manga will focus on the tournament but Bulma's quest for more information should be revealed soon.