As you yourself have indicated, there is presently only vague news of the web version of WhatsApp. The company itself has not officially announced anything. Nor have they given so much as an outright hint!
As of today, some sites like softonic.com have provided ways & means on how to use WhatsApp in a web browswer. This does mean accessing WhatsApp on your desktop or laptop, but not everybody has been successful with this method. Also, such methods do not excite die-hard WhatsApp fans because it means opening another account since you cannot use your existing account to install it in the browser. That, obviously, is annoying.
The bottomline: no confirmed official news of WhatsApp having any footprints on the Web!