As reported by One Mile at a Time, United Airline’s new non-stop flight between Newark and Johannesburg, South Africa begins March 27th, and business class awards are widely available in the summer of 2021.
Here are the results of a search I ran for two adults flying Newark to Johannesburg:
Each of the days that show 70K are available at United Saver levels. This means that you can book these flights for even fewer miles with some partner airlines. For example, via ANA (which transfer from Amex Membership Rewards), you can book this flight round-trip for only 104,000 miles (compared to 150K miles via United):