Easter eggs in the Deadpool 2 teaser

They're not easter eggs Logan's too obvious. The writing on the phone booth is too small to read

Pretty sure the inside of the phone booth has a Dbz reference too

The writing on the phone booth says "Nathan Summers coming soon". This is hinting at the fact that Nathan Summers aka Cable is going to be in the next Deadpool movie.

Is that Firefly in the third one....?!