Thor: Love and Thunder is based on Jason Aaron’s amazing run on Thor, where Jane Foster becomes Thor after Odinson was found unworthy after the events of Original Sin. While she took up the hammer in a comic titled Thor, the bulk of her was in the most recent Mighty Thor series, and that’s the title she’ll hold in the movie.
Taika Waititi corrected someone on Twitter today who called her “Female Thor”, saying she’ll be referred to with the Mighty title:
Correction. She's called Mighty Thor.— Taika Waititi (@TaikaWaititi) July 21, 2019
While Avengers: Endgame established Odinson as still worthy of Mjolnir, it’d be interesting if they go in a different direction and make him the Unworthy Thor after the decision he made about his path in life at the end of that movie. Jason Aaron made Odinson the Unworthy Thor in the comics, and he even had an amazing mini-series, so it’s something worth thinking about in the MCU.