You can read a little bit about the new Trezor 2 in this[1] blog post by the Trezor team and in this article[2].

TL;DR of some features:

1. First of all, the Trezor 2 will come with a full-color touchscreen display, which is quite an interesting decision.
2. Furthermore, the Trezor 2 will include a MicroSD card slot, which can be used for separate data storage or as a way to keep a copy of private keys in an offline manner.
3. Last but not least, the device’s processor will undergo some major changes as well. The biggest changes will occur under the hood.
4. Developers will be able to create custom versions of firmware if they prefer to do so. This sounds quite similar to flashing a custom ROM on an Android phone, which is always at your own risk.

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[1] https://blog.trezor.io/trezor-security-beyond-bitcoin-c99f27b18b6b
[2] http://www.bitcoinisle.com/2017/06/12/what-is-the-trezor-2-hardware-wallet/