Hi Eric!
You can find the official integration by following this path: Marketplace > Things > Climate Control > Thermostats > Honeywell
I would also like to point out that there are some known issues that will affect a small portion of users. The most prominent issues are listed here: Honeywell RTH9580WF is ready
We’re still actively working on improvements, but we felt we should get it out there because it’ll work great for most homes and really, it’s been long overdue.
Cheers!