Going on claire's guesses:
Lisa's going to be in the bottom 2 again. The Cha Cha isn't the easiest dance to do, so that'll guarantee her a midtable position in the table at best with the judges - unless they attempt to overmark to save her. The Foxtrot should be ok for her as long as she solves the gapping issue.
If they give Rachel and Vincent the Paso and Tango in the same week it could very much be do or die. If she can pick up the aggression of one, it should flow into other. If she struggles, though, the week could be something of a nightmare for her.
Austin's upper half will cause havoc in the Salsa for him. I don't know how he can cut it loose, the judges certainly don't give him any assistance. I just hope Erin manages to sort something out, because he can't afford too long in the midtable, though he does appear to have public support. The American Smooth should be ok for him, though again the issue with it is it does require upper half fluidity.
Considering Tom got through the Salsa with four 9's I can't see the Samba being too much of a rough deal for him, he can work his hips, has some bounce and has good rhythm - I don't know why but I think this could be the dance of the series. The Waltz should suit him as well: I'll be surprised of he doesn't top the leaderboard this week.
The Vienesse Waltz is perfect for Christine and I think it may be the ballroom dance of the night. However, I always get nervous about the rumba and how the celebrities manage to act it. I fear Christine struggles to hone in her bright and bubbly personality, and she may fail to succeed at the Rumba because of that.