WildFire v4 is very similar to v3. The biggest difference is it uses an ESP8266 for its Wi-Fi module rather than the (discontinued) CC3000. You can get all sorts of info about it at wildfire.wickeddevice.com. You can also buy an assembled v4 from here: https://shop.wickeddevice.com/product/wildfire
Hope that helps! Anything not CC3000-specific from David’s tutorials should still apply.