The obvious implication is that the new guys are from Rick or Hershel's past, and that they are characters we think to be dead. I'm here to argue that this isn't so.
I've read the graphic novels which the series was based on, and new characters are introduced out of nowhere all the time, so my guess is that these two new guys walking into the bar aren't old fan favorites back from the dead, but entirely new characters, and by "goddamn, you're alive," they actually meant, "They're not zombies, but regular people."
This of course means that the sneak peak was intensionally misleading.
Which is why they suck
I'm not saying that the next half of season 2 isn't going to be amazing, I just wish they would be honest with us.
For good measure, here's the link.
....
I couldn't find it...