So, that is either "now available on iOS" as the title suggests or a call for beta testers (as the web page suggests) or a crude way to collect mail addresses (because the "beta signup" really leads to a waiting list form).
This is a call for beta testers and we'd like to hear what users worldwide have to say about WiFire. We will send you a TestFlight invite once we have your email.
WiFire uses the new iOS 9 NEHotspotHelper APIs so it's a very slick experience right from the Wi-Fi settings screen on iOS.