Remember to keep in spoiler tags everything about the two girls who go home.
The rumored girls are Trisha and Shauvon. Trisha pushes Parisa, and gets sent home. But you have to ask someone else about Shauvon, preferrably someone who's big on spoilers. I think Shauvon goes home by herself after this fight she has with Cohutta. You may have seen both situations in the previews.
Talhada replaces Trisha, I think. She's the black girl in braids seen a lot in previews. I haven't seen Ashli in previews at all, which leads me to believe that she comes into the house very late into the season, just like Charlie came into the San Diego house. But she can be seen on her myspace. A link was posted a while back.