TREZOR Wallet has integrated Zcash in previous releases, but the Wallet has been supporting Zcash only on the beta chain of the wallet. Starting today, the beta graduated into a full version. Zcash is supported directly on the main wallet chain at wallet.trezor.io. You will need the latest firmware update (1.4.2) on your TREZOR to use it with the Wallet.
More information can be found on our blog: blog.trezor.io