This is your chance to bail now and go into the film with a clean slate… SPOILERS ahead.
If you're still here, then you want to know… so lets go.
Recently it was revealed that Sylvester Stallone was playing Stakar aka Starhawk from the original Guardians of the Galaxy where he was teamed with Yondu. The the film, Yondu, played by Michael Rooker, has had a major falling out with Stakar, who is one of the heads of the Ravagers. It's said that James Gunn is using the Ravagers as the original Guardians in a way.
Now add in the reports of five after credit scenes and that Gunn will be returning for Guardians 3.
With the cast and crew all doing interviews now, leaks are starting to happen and word has gotten out that one of the post-credit scenes is a meeting where Stallone talks about getting his original crew back together to steal some stuff. This scene includes four other characters. Two of which are played by Ving Rhames and Michelle Yeoh.
Gunn was asked about who Rhames and Yeoh play:
Well, you can read the credits so. Right? I mean, yeah, Ving Rhames is Charlie-27. Michelle Yeoh who I'm an enormous fan of from – I'm a big fan of '90s Hong Kong films. She's a very wonderful person. She is Aleta Ogord who is the other Starhawk, the female Starhawk.
As for the other two characters, one of which is red skinned, they're even more obscure:
That's Krugarr. And then Mainframe is the last one. With all the post-credits scenes on this movie, they're all funny and fun, and most of them are things we hope to see continue on in the MCU. Whether that's a supporting role in future movies or whatever, I think it would be great to see those things and those characters show up.
Kevin Feige added:
They're definitely the original Guardians. That was the fun of it and when James had the idea to do more with the Yondu character – who is also an original Guardian – there was the notion that he had a team once like Peter does now. That'd be fun to see them. And [Ving Rhames] is definitely Charlie-27.
Charlie 27 is one of the original Guardians, Aleta came in later on. Krugarr is also from the Guardians, he is a Lem that was trained by Stephen Strange and became the Sorcerer Supreme. Mainframe is an alternate reality version of the Vision. Though there is no confirmation, I still thing Michael Rosenbaum's character is Martinex… which means only Vance Astro and Nikki are missing from the original team.
Hopefully we'll see them all in Guardians of the Galaxy Vol 3.