As you can see from an answer given by a Trezor's staff member in this reddit post on 5th October 2017:
We will do an official communication once it is clear what Segwit2x is and what is not. Currently, there are some changes in the Segwit2x queue which might or might not be accepted and this can change significantly what steps would need to be done.
EDITUPDATE This is the official Trezor Statement on Segwit2X Hard Fork :)