Good (if confirmed).
Harrison might not view Han as a meaty or very three-dimensional character to sink his teeth into but he knows what he meant to a generation of moviegoers who grew up with the OT. He's be insane to turn down the enormous paychecks that being in the Sequel Trilogy would mean along with the potential kick in the pants to his currently lethargic career.
He can complain all he wants about Han Solo being a character without any challenges or excitement to play, but if Disney and Lucasfilm dangle a big enough check in front of his eyes he'll jump in and give it everything he's got for a guy in his seventies.