Here's a little theory about the outcome of this posted on NF that would actually be very good. I'm hoping this actually happens.
There is another possibility which I mentioned last week. Sasuke could use "that jutsu" which Orochimaru told him not to use in order to finish Orochimaru, but lose control of it so that it blows up in Sasuke's face and badly injures him. This would serve as Sasuke's fall and would prevent Orochimaru from immediately taking him over. It would tie in with Kakashi's warning about the risks of powerful jutsu. It would be a huge setback for both Sasuke and Orochimaru, possibly prompting Orochimaru to look for an alternate container, i.e. Yamato, and progressing the plot.
And it would be very, very, very satisfying.