From the blog post on the firmware update:
Zcash Unified Address
Trezor Model T firmware now supports the sending of funds to the new Zcash unified address format.
But I still can't send to a unified address:
A ZEC unified address that is claimed to be invalid by Trezor Suite
And the Receive UI in trezor suite doesn't offer a unified address either.
So what is this update really about?