Here's the official press release:
https://comcastspectacor.com/news/20...-announcement/
The plan is for the new arena to open in 2031, so there's still a long way to go.
The deal will also see them come up with a new plan for the downtown area where the Sixers were planning on building their new basketball-only arena. Comcast (which owns the Flyers) will get the naming rights to the building and a minority ownership stake in the Sixers.