As for as prior reports go, UploadVR reported last November
that Valve was indeed working on its own headset with a wider, 135-degree field of view, and we also know that Valve has been working on its own set of so-called "knuckles" motion controllers that it's been testing with developers for quite some time. But Valve layoffs earlier this month complicated speculation about a new VR device, as the company reportedly slashed its VR hardware division, according to a Reddit leaker who a year earlier posted photos of a prototype headset that could very well have been an in-progress Index.
Regardless, it's clear now the headset does exist. We'll hopefully get some additional information ahead of the May 2019 target, which may just be a reveal event window and not at all related to the launch. Valve will be entering a crowded marketplace, with Oculus planning to launch both its standalone Quest and Rift S headsets this spring and HTC having just launched its enterprise product, the Focus Plus, and gearing up to launch its new Vive Cosmos headset some time this year or next.
When we asked Valve if it could offer any additional hints — or clarify if this was simply an early April Fools' joke — Valve's Doug Lombardi only replied "Not April."