She-Hulk Doesn't Waste Any Time Telegraphing This Classic Hulk Story
Warning: Contains spoilers for "She-Hulk: Attorney at Law" Episode 1
Bruce Banner (Mark Ruffalo) is heavily featured in the first episode of "She-Hulk: Attorney at Law" and is instrumental in helping Jennifer (Tatiana Maslany) acclimate to her new life. We find out pretty early on how Jennifer gets her powers in a story kind-of-but-not-really similar to her comic book tale. She and Bruce get fairly injured in a car accident, and blood from his head drips into a cut on her arm. Boom: She-Hulk.
But what causes that accident is probably the most interesting thing in the scene. A Sakaarian ship flies in from out of nowhere and pulls up right in front of Jennifer's car, causing her to swerve. Why would someone from Sakaar be on Earth? They're certainly not looking for Jennifer, as she's just a measly human at this point. The answer is simple: someone from Sakaar is looking for the Hulk. Perhaps the Grandmaster (Jeff Goldblum) is hoping to recover his beloved champion. This brief Sakaarian ship appearance might hint at something major in the MCU.
Is World War Hulk finally coming?
The appearance of the Sakaarian ship suggests we are not done with the planet that debuted in "Thor: Ragnarok." And the biggest storyline involving Sakaar in the comics is arguably "World War Hulk." It could be a bit of a stretch, but the person (or creature) piloting that ship might be Skaar, Hulk's son from Sakaar. Keep in mind that this would be full-blown Hulk's offspring, not Bruce or Smart Hulk's. The latter two wouldn't even know he exited.
In the comics, Hulk lands on Sakaar after The Illuminati boot him off of Earth. While the MCU would likely have to tweak the story on how Hulk went back to Sakaar, it's entirely possible we'll get the "World War Hulk" storyline at some point. There's potential for Smart Hulk to be overrun by "Ragnarok" Hulk, who would be beyond angry to have his good life ripped away from him on Sakaar and buried underneath the new Professor-ish green guy.
There doesn't seem like much of a reason to reintroduce Sakaar if it wasn't going to include the "World War Hulk" story, which heavily features Doctor Strange, Iron Man, Black Bolt, and Mister Fantastic. There would have to be some very creative writing here, but we wouldn't be surprised to see a "World War Hulk" card on one of the empty spots on Kevin Feige's Phase 6 timeline.