I’m not quite sure what you’re asking. There are a number of HomeKit devices which are entirely wireless, for example there’s a whole line of Elgato Eve sensors.
There were two separate issues prior to June 2017.
First, Apple required that any HomeKit – compatible device have a special encryption chip. That was hardware. But, as with the Elgato sensors above, those could be included in a wireless device.
Second, and this is the more important one with regards to Z wave, Apple limited the functionality that compatible devices could have to some very specific device classes. A lot of that had to do with security. And that was the basis on which two previous Z wave/HomeKit bridges were denied.
However, as of June 2017, Apple has now addressed the first issue by allowing for a software – only compatibility path. And is dealing with the second issue by allowing hobbyists to add HomeKit compatibility to pretty much any device that they’re using only for themselves, with the idea that people can make their own security assessments in those cases.
Meanwhile, Zwave has introduced their security 2 framework, which they have described from the beginning as having “HomeKit like levels of security.” This helps address from the Z wave side some of the second concerns for products which would be sold commercially.
So things have changed significantly just in the last 10 months. Whether that means there will be a Z wave/HomeKit bridge and exactly what functionality it will be allowed to have, we just don’t know yet. But it does look a lot more how hopeful than it seemed at this time last year. 