Has there ever been a season in which we have gone so far into the Race and still not known squat about one Racer? I'm speaking of Christina. The whole storyline with her and her dad has revolved around Ronald's boorishness and hernia. We don't know jacksquat about Christina, except that she's been a saint for putting up with him as long as she has. They sort of remind me of Peter and Sarah that way. As such, I think they'll get the last boot.
TK and Rachel still appear to be getting a Kris/Jon edit; they're the same sort of team. Although we don't know that much about them, they've been getting just enough face time. Now with K/V out of the race, they're the only semi-popular team to root for.
Nick and Donald look like they're heading for third a la Lyn/Karlyn, another team that no one ever expected to make F3. Donald is already the oldest Racer to get this far; he's slightly older than Meredith, who finished 4th with Gretchen. Unlike L/K and M/G, however, N/D have won a leg, albeit via FF. They may say they're in it for the million, but for them, F3 is the real accomplishment.
That leaves Hate and Jennifer (thanks Frisque) as the winners. If they do, one of three things will happen with their relationship: 1) Nate will propose (Colin/Christie, Hayden/Aaron, Ray/Yolanda)*; 2) they'll decide they really aren't made for each other (Mary Adam/Rebecca, Ron/Kelly, Eric/Danielle); or 3) they'll just leave things in limbo (Rob/Kimberly, Brandon/Nicole). I'm hoping for #2. I'm half expecting #1.
The only question remains whether they will win a leg before the finale.
*Note that two of those three were rather dysfunctional teams with one member definitely being high maintenance.