[WorldMaker]

This seems to be a web-based mini-client of Skype for Business now available for non-Office 365 teams. They say it has more restrictions that Office 365 users of Skype for Business: Primarily conferences are limited to 10 people in a conference in the first 60 days of a (non-Office 365) team using it and 3 people after that.

This seems to be an attempt to upsell teams currently using Google Hangouts to try Office 365.

It may also be a slipstream announcement that the web-based client for Skype for Business has gotten better? I can't tell based on just the blog post. Something to investigate maybe.