Natalie in Ragnarok?

 In the last few hours the rumors about a possible Natalie’s cameo in Thor Ragnarok have been revived, thanks to an enigmatic tweet that Taika Waititi, the director of the film, posted this weekend. In it you can see Natalie in two similar images, belonging to Leon and Where the Heart Is, the phrase: “Heed the signs”, and the hashtag “Ragnarok”:
Heed the signs. #Ragnarok pic.twitter.com/ug2crhTFtK
— Taika Waititi (@TaikaWaititi) May 6, 2017Does this mean