There are already chargers all over the place. Why is this a big deal?
The Combined Charging System, or CCS for short, represents an attempt to establish a standard universal plug for all electric vehicles -- kind of like standardizing electrical outlets in your home. Most current CCS stations in America are 50 kW, and Tesla's non-CCS compliant Superchargers are 145 kW. A third option used by Japanese manufacturers, called CHAdeMO, is limited to 100 kW. But the new charging system being built by BMW, et al., is capable of 350 kW -- which means very, very fast charging times.
The companies already onboard with CCS include, in addition to the four mentioned above, Hyundai, General Motors (Chevrolet, Buick, Cadillac, GMC…), and FCA (Fiat Chrysler, which includes Dodge, Ram, Jeep, and Alfa Romeo).
With the ubiquity of electric cars already on the horizon, to have such a sizable chunk of the future market share already committed to CCS means it's likely to achieve critical mass, forcing all other companies (cough Tesla) to either take the path of least resistance (compliance) or stake tremendous risk on their own systems.