For Anaheim, they acquire the fifth overall pick in the 2022 draft in Cutter Gauthier, a very highly ranked prospect in his own right. He's coming off an impressive world juniors performance with team USA. According to several sources, Gauthier wasn't willing to sign with the Flyers at all, necessitating Philly to make the trade.
It's a massive and unexpected trade out of nowhere, and right now, we won't know who won this trade for years to come.