So, there may be some FUD here, but…
Take a look at the article above. It’s a bit concerning for those who play in the Apple playground. This quote in particular:
…Apple limiting the list to non-Wi-Fi accessories that “don’t offer users control of the home.” This rules out a lot of accessories such as thermostats, door locks, and even light bulbs, which will have to go directly through the MFi program and implement the HomeKit protocol.
Perhaps @Ben or even @alex (I don’t usually call Alex, but this one is a biggie) can offer some insight into this? I’m hoping that either the information is incorrect, incomplete, or the program is still in its infancy and more functionality may be announced soon.