Question about Discs

Will we play the Multiplayer on the Reach disc we have now or another disc that comes with HCEA? I’m assuming another disc, but has this even been confirmed?

It has been confirmed to all be on one disc Q&A with Halo: Anniversary crew
Included in your Halo CEA disc, I believe there will be a code you can enter in Halo: Reach to access all the new maps so you dont have to keep on switching discs all the time.