There have been many reasons to sweat over whether the Nexus 6 will come with wireless charging support. The new Moto X that it's derived from doesn't support the feature, and there's zero mention of it on Google's Nexus 6 page. Well, you can rest easy now. This year's Nexus phone will still have support for wireless charging. It's listed on the device's full spec sheet.
The support is built-in, so you won't have to invest in a case or some other contraption to get things to work.