I don't think it'll be a great undercard, but I think with Eddie promoting his first show on ppv they might be keen to make sure there's a relatively decent bill to back up the main event.
Because it's on champions league final night, I think Sky will probably start at 10pm. They've said that Froch/Kessler will take place probably around half 11 so there's room for one or two other fights on the tv part of the show. I think the untelevised card will probably feature the usual likes of Ochieng, Ryder etc then I think they might have Yafai open the ppv (to build hype for him), then if maybe Frampton or Barker as a sort of co-feature.
It'll be interesting to see who's on it but I wouldn't be too optimistic.