From an e-mail I received today:

United announced yesterday it had reached an agreement to code share with South African Airways which will expand the international options for both carriers. SAA flights will connect at Dulles with United flights to San Francisco, San Diego, Seattle, Los Angeles, and Las Vegas. The code-share begins November 1. SAA flights will carry United's code on the Dulles Johannesburg service and within Africa and between South African and Europe.

Only 217 days to go! Cheers, Anne