Han Solo’s wife has been revealed in issue #6 of Jason Aaron and John Cassady’s official Star Wars comics (and official new canon). Only it’s not Leia. The newcomer introduces herself as Sana Solo, much to Han’s chagrin.
The storyline is set between A New Hope and The Empire Strikes Back. After Disney purchased Star Wars from George Lucas the Star Wars Extended Universe comics and books were declared non-canonical, so there’s a vast amount of room for new stories. No word on whether Sana will figure into The Force Awakens, but I am sure Han got his divorce sorted out.