WWE's new Mixed Match Challenge (which will air starting on January 16th on Facebook live) has been slowly announcing the random pair-ups for each brand.
The first team for RAW is the pairing of Braun Strowman and Alexa Bliss while Bobby Roode and Charlotte Flair are repping Smackdown Live. WWE seem to be playing up some tension between Bliss and real-life best friend Nia Jax due to the fan campaigning that failed to get Jax on a team with Strowman instead.
They will be announcing a new team each day until the debut show. It will air immediately after Smackdown with 205 Live to follow that on the WWE Network.