There are changes being implemented to both sides of the APIs (see this thread). There was a bit of learning when we released the Honeywell thermostats and are making changes before the Evohome goes out.
The Evohome will probably not be able to trigger Routines out of the box (to prevent an edge case like a cold day accidentally kicking on I’m Back when the heat fires). I do not have a complete capability list yet, but will flag the request so that the community can potentially have access for custom SmartApps.