The placeholders aren't Omid and Christa, but I think that is just because Telltale wants to keep us guessing about the identity of the two silhouettes, and knows people would play around with the game to see if the two shadowy figures were the models of Omid and Christa. I don't think any conclusions can be drawn about the choice in placeholders.
I personally think it was Omid and Christa. There is no way to know for sure of course, and that is why Clem was so nervous and unsure of whether she should call out to them. No one of us will know for sure who they are until season 2.
One thing I'm absolutely certain of however is that the two people aren't walkers. Walkers wouldn't have seen Clem from that far off, and the second person reacts to the first spotting Clem. If they were walkers, the second would probably keep stumbling forward for a bit, oblivious to what the other was doing.
Whoever they are, they're people.
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