This will control your fan, and is compatible with the HomeKit Lutron hub. I've got one set up right now.
http://www.amazon.com/Lutron-PD-6AN...rue&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER
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Oh where to start.
Yes, HomeKit does allow you to control your stuff with Siri. But what HomeKit is more than anything is a standard. It's a standard that states that all of the various products being offered, whether they be from Lutron, Schlage, Ecobee, Phillips Hue, LiftMaster or whomever will meet specific minimum security and compatibility requirements.
It means that all of your devices can see the state of the others. It allows for third party apps, not even associated with any of the manufacturers mentioned above can control all of their devices (such as the Home app that I use) so that they can support things that the manufacturers haven't even thought of yet. Such as geofencing and recipes.
The security aspect of HomeKit is paramount. Apple's requirement of a specific hardware module that must be encrypted and be validated with your Apple ID is key in making sure that your devices are safe from being hacked.
The resistance you see from certain manufacturers when it comes to HomeKit is usually born out of greed. Rather than submit to a standard that benefits the consumer in the long run many companies want to run their own proprietary ecosystem, thereby forcing you to buy their products for all of your needs, assuming that they even have have products in all of the areas of home automation that you want.
With HomeKit I can buy a Schlage Sense lock, and know that it is going to work better than August, and be more secure than Kwikset Kevo. Or if I want one of those other two I can choose them. I can buy an Ecobee thermostat, or I can get a Honeywell. I can buy Phillips Hue lighting, or I can buy Lutron. And no matter what, I know that I will be able to make them all work on tandem with each other, and that they'll all be secure.