https://twitter.com/DisneyD23/status/1165058557789687808
‘JUST ANNOUNCED: Hello there! Ewan McGregor will reprise his role as Obi-Wan Kenobi in an untitled series for #DisneyPlus! #D23Expo’
or
https://twitter.com/starwars/status/1165066376429486080
‘Hello there! Just announced at #D23Expo: Ewan McGregor will reprise his role as Obi-Wan Kenobi in a new original series, coming to #DisneyPlus.’
and also here:-
https://www.starwars.com/news/the-galaxy-far-far-away-just-got-a-little-bigger
‘The Disney+ panel was the first to announce an all-new Star Wars series in development, one that many fans have been asking to see since the closing scenes of 2005’s Revenge of the Sith. Ewan McGregor, who played Obi-Wan Kenobi, electrified the audience when he emerged following the announcement of his involvement in a new series taking place eight years after the events of Revenge of the Sith, where we last saw Obi-Wan delivering the infant Luke Skywalker to his Tatooine homestead.’
and…
https://twitter.com/getfandom/status/1165060686449238016?s=21 (with video of the announcement)