From what he showed in his youtube video, he will ride a factor.
Had this discussion on twitter, someone pointing out he will ride a track bike. I guessed he would either ride a Slick as in the the video or a Shiv which he has been using in the worlds. In the cyclingnews article it was mentioned howver he won't ride a conversion of a road tt bike but instead a track bike. So guess nu Slick / Shiv. Fsctor doesn't have a track bike..