Jim Kerr has just announced on his Facebook page that he is going to watch U2 live next week... Then on stage in Glasgow or in Paris. It's been a long time now since they haven't played together !
Simple Minds will start the new leg of their arena tour 14-15th November in Belgium. I guess they will use next week for final rehearsals, so probably Jim Kerr won't have time to make an appearance in Paris.
As Glasgow is their hometown, it would make sense that Jim Kerr will attend the Glasgow-shows. SO if there is a guest performance by JK, it will be in Glasgow.