From https://nitter.net/wojespn:
BREAKING: The Indiana Pacers are finalizing a trade to acquire All-Star F Pascal Siakam in a deal that will send Bruce Brown, Jordan Nwora and three first-round picks to the Toronto Raptors. New Orleans will be a third team in deal, sending Kira Lewis to the Raptors.
Indiana is sending two 2024 first-rounders and a 2026 first to the Raptors, sources said. New Orleans sends a second-round pick to Indiana.
The 2024 first-round picks will be Indiana’s own and the worst of Utah/Houston/Clippers/OKC, per sources.
The Pacers send their own 2026 first-rounder in deal, sources said.
The Pelicans will send a 2024 second-round pick to the Pacers in three-team deal, sources said.
My guess is Siakam gave some indication to Warriors that he wouldn’t re-sign unless they got their shit together, which seems unlikely to happen. Pacers already have their shit together, so I could see him as expressing a desire to re-sign if he were to get traded there, which probably facilitated the Pacers FO being willing to trade.