When pressed, by none other than talking tree-opponent Neil deGrasse Tyson, Gunn revealed the detail stems from details in the background of the first film.
I did something in the first movie of Guardians where it was in the background but it was distinctly there, and people know that it’s there.
Even before Guardians of the Galaxy Vol. 2 opened in theaters a few weeks ago, James Gunn was already attached to write and direct a follow-up to conclude the trilogy and even revealed he had already begun writing the sequel.
We’re not sure which of these (or another unnamed piece of info) Gunn is wrestling with and we’ll likely have to wait until 2020 for the answer.