My understanding is that Nine will have four games to select for Thurs, Friday, Sat evening, and Sunday afternoon, and Fox gets the remaining four, plus be able similcast all the Nine games on Foxtel, however Nine are demanding that the games that are similcast must not have the Nine commercials edited out, so basically whether you watch it on Nine of Foxtel will make no difference.
I imagine it will be up to Foxtel as to whether it does it's own commentary or uses Nine's, my guess is that it will use Nine's.
So basically having a Foxtel subscription will only now give you an extra four games live commercial free, as opposed to free to air TV.