Natasha Liu Bordizzo has been cast as the live-action Sabine Wren in the Star Wars: The Clone Wars and Star Wars Rebels.
Dawson made her debut in The Mandalorian season 2 when the quest of Pedro Pascal's Din Djarin to find a Jedi to train Grogu led him to Ahsoka. She refused, considering Grogu too old to train and too attached to Din Djarin, having learned the risk of attachment when she learned Return of the Jedi. The final episode of Star Wars Rebels saw Ahsoka's friend Ezra Bridger sacrifice himself to defeat Thrawn, summoning a group of Purgills - space whales - to attack Thrawn's fleet and drag his flagship into hyperspace. If Thrawn has indeed returned from the Unknown Regions, then it's highly likely Ahsoka is looking to find out what happened to Ezra.
Now Natasha Liu Bordizzo (The Voyeurs, The Society) is confirmed to have ed Ahsoka as the live-action Sabine Wren, another of Ezra's friends from Star Wars Rebels. The two were seen together in Star Wars Rebels' season 4 finale, which saw Ahsoka approach Sabine and ask her to help look for Ezra. Now, with the casting of Sabine, it really does look as though Ahsoka is serving as a Star Wars Rebels sequel, continuing the story. It's surely just a matter of time before other of the Star Wars Rebels crew are cast, notably Hera Syndulla and, of course, Ezra himself - and Grand iral Thrawn is surely on the way, too.
It's impossible to say how this is going to play out, though. Most viewers believe Lucasfilm is making a live-action version of Timothy Zahn's classic Thrawn Trilogy, which essentially launched the old Expanded Universe back in 1991. If so, Ahsoka would be the Jedi who takes the place of Luke Skywalker himself. But Zahn's latest canon novel, Thrawn Ascendancy: Lesser Evil, has recently Star Wars Rebels, revealing he was never loyal to the Empire at all, but rather infiltrated the Empire on behalf of his own race, the Chiss, who believed the Empire could potentially help them against threats from the Unknown Regions. He always intended to return to his people, meaning there must be a reason he's returned at a time when the Empire should have been long gone.
Lucasfilm's Dave Filoni has always insisted there won't be a season 5. "I was really happy with how that series turned out, and I feel like we got to tell a complete story there," he observed in one interview. "I think that there’s always potential for stories that involve the characters from Rebels, which is maybe a better way to put it. They’ve all earned their place in the galaxy, so to speak, so I’m sure there’s some more for them to do." It looks likely that this potential is about to be realized, because instead of a fifth season of Star Wars Rebels, audiences seem to be getting Ahsoka as a live-action sequel.