United debuted their new Polaris lounge at Chicago O’Hare in the old club and first class lounge space at gate C18 today. This is a business (and first) class lounge. It is not a Star Alliance Gold lounge and not a United Club.
There’s a trend towards modestly improving membership-based lounges and substantially improving business class only lounges at least at United and American. As with changes to frequent flyer programs the best service and benefits go to those spending the most on a given trip, not over the course of a year or a lifetime.