A recent post on ResetEra uncovered new beta files that were added to the Steam Beta Github repository, and within those files lay a string relating to Steam’s networking identity which featured an optional string directly below it that reads “xbox_pairwise_id”. This string could very well indicate that in the future, Steam may be accessible by users with their Xbox Live ID.
Below is an image containing the line in question:
Cross-play between Steam and Xbox does already exist in a handful of titles, but this recently revealed code could signal the start of a far more extensive cross-play environment between the two.
Valve has not yet made any official statements about the new code but should the changes some to pass, there will definitely be greater pressure from the gaming community advocating for a more integrated gaming environment from other console manufactures.