One thing I haven't seen people touch on is the size of the game. I reckon >180GB with aggressive compression on the disc or pre-download; and >250 installed on the drive. In which case, I'd be surprised if this doesn't come on two discs on PS5. That is unless they pull a fast one and don't put some or all of the game on the disc, requiring a download.
Then there's XSX/S as well, they only allow BD-50 discs, so if it's sizeable, I really do wonder if they might need 3-4 discs (unless MS can patch the console to use UHD for games). I can't see even Xbox skipping physical for a game that's this big of a deal.
4 BD-50s and 2 UHD-100s both come in around the ~$6 mark for 10m+ units in regards to materials and stamping. So they could just mark the price up $10, pocket the extra ~$4. No real reason not to release physical still as it's not like multiple discs are a major inconvenience, you only need them for the install and like normal, you'll just use one of the discs as a key when playing.