So, the first instagram post you did that teased La De Dah De Dah De Dah De Day Oh was Nov. 3rd, 2017, and the release date of that video was Jan. 16,  2018. That's about 2.5 months, so does that mean it is likely that the new song/video is coming out in May?
i haven't posted any instagrams for the new song yet, but that's not the only thing wrong with your calculations