From LRM:
“It looks like Disney or Hayden Christensen are not done with the Skywalker Saga after all! With the recent success of the last season of The Clone Wars and the love for the prequels continuing to grow it seems that Disney wants to capitalize on this wave. Our source shared with me that producers are currently in talks with Hayden Christensen to reprise his role as Anakin Skywalker in the Obi-Wan Kenobi Disney+ series! How big of the role is still being debated, so let the theories begin. My guess is that we would see Anakin in some sort of dream sequence that Obi-Wan would have. While this may sound crazy this would not be the first time that Hayden Christensen has returned to this role. Remember at the end of The Rise Of Skywalker we heard his voice in the Jedi sequence with Rey.
Our source mentioned that this would be of course neither confirmed nor denied by everyone at Disney and Lucasfilm including Hayden. The plan is to announce this news at Star Wars Celebration along with Rosario Dawson being cast as the live action version of Ashoka Tano. This makes sense on why Star Wars Celebration has not been canceled yet.
The Disney+ Obi-Wan Kenobi series is scheduled to start production sometime in early 2021. Ewan McGregor is set to reprise his role as Obi-Wan and Deborah Chow will be the showrunner for the six-episode series.[…]”
Naboo News 
I’m not fully convinced. I’m happy to hear the rumour, but I won’t be getting my hopes up so high this time after the catastrophic failure of such gossip last year.
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It would be great if there were some flashbacks to the prequel era, as Hayden could be in those and they could even involve other characters like Qui-Gon, Mace Windu and Yoda with their respective actors (maybe even Padme at a stretch). The flashbacks would need to have some relevance thematically to whatever storyline was in the series though so as not to feel gratuitous (not that I’d care but others would). Having met Hayden last summer at a convention, I was surprised at how deep his voice is now so he may need to up it a bit (didn’t notice anything odd about his RoS cameo, recognised it immediately so maybe he can do that already).
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