The image features members of the Guardians of the Galaxy including a first look at Mantis, played by Pom Klementieff. We also see the return of Groot, though per the image apparently as a sprung (i.e. baby Groot).
James Gunn also offered on Facebook that it remains to be seen whether or not Karen Gillan's Nebula is a member of the Guardians of the Galaxy, but did confirm Michael Rooker's Yondu has joined the squad.
"Yondu for sure. With Nebula, well, you never know what's up with that one," Gunn said.
Guardians of the Galxy 2 executive producer Jonathan Schwartz also offered the following to EW.com about Mantis and Groot:
“She has never really experienced social interaction,” Schwartz aid. “Everything she learns about dealing with people, she learns from the Guardians of the Galaxy, which is a very weird group to learn your social intricacies from.
“He doesn’t have the wisdom and experience of that Groot,” Schwartz said. “He’s a younger Groot and a more rambunctious Groot. The question is, is he the same Groot, just smaller? Or is he a different Groot that’s sprung up from the seed of the first Groot?”
James Gunn and the cast of the Guardians of the Galaxy 2 will also be at Comic-Con, with a teaser being released exclusive to the SDCC.
"Guardians of the Galaxy Vol. 2" has a May 5, 2017 release starring Chris Pratt, Zoe Saldana, Dave Bautista, Karen Gillan, Bradley Cooper, Vin Diesel, Michael Rooker and Sean Gunn. New cast members include Pom Klementieff, Elizabeth Debicki, Chris Sullivan and Kurt Russell.