But are you still assuming the Surfer will only be a minor reference? Based on the comments we've been getting, I'm assuming we're going to get something like the follwing:
Surfer shows up possibly with some connection to the cloud from the first film or Doom or Franklin. The FF spend some time battling him before realizing the real threat is Galactus and then they battle and, somehow, defeat him. I'm assuming Galactus is the "other" villain.
While I'd love to see a well planned trilogy in which Galactus is the final act, I don't think that's likely at this point, and I'm betting we'll get full Galactus in this film.
Here's Avi's Quote:
Regarding Galactus: "They'll be some pretty big surprises. What we're trying to do is not to show him, but to show someone else, initially."
I'm assuming the "someone else" is the Surfer.
And then Jessica's quote:
"We start 'Fantastic Four 2' in August," said Alba. "The four of us learn that there are other people out there with superpowers, and the Silver Surfer appears as a villain/hero. And another villain comes in as well. My character, Susan Storm, has another love triangle and may use a power people haven't seen before. She's the most powerful of the four."
The "other people with superpowers" could be a quick summary at the beginning to show that they've been learning, battling and growing over the years, or it could just refer to the Silver Surfer and Galactus (remember Jessica isn't really a huge comics fan, so she could just be using that as a quick way of referencing the Surfer, Galactus and maybe even the Watcher).
The Silver Surfer, as we know, is a villain/hero in the original story, and of course the "other villain" would also fit the original Galactus story.
I'm hoping that Franklin is the "love triangle".
It all seems to fit very nicely with a faithful telling of the Galactus story.