An update to the comic announcement included a couple of promo images, one of which Kelpie posted up here a few days ago, with what might include the ghost Starscream... which would be one obvious choice for the classic Ghostbusters to be chasing after... I just think if this story is set in the 1980s, Starscream wouldn't be dead yet (unless they are referring to his post-Beast Wars appearance, and he has been floating around for a couple million years).
When the Transformers pick up on a strange Cybertronian signal emanating from Earth, they travel to the planet only to discover that the threat waiting for them there is something that Venkman, Spengler, Stantz, and Zeddemore are perfectly suited to help them take on. The five-issue series will feature a variety of variant covers illustrated by Dan Schoening, Paulina Ganucheau, Nick Roche, and Alex Milne, and hits stores this June.