If you subscribe to the premium Elite you will get the maps on the basis as you would with the hardened edition. The hardened will give you founder status and a special camo, but everything else will be the same between premium subs and hardened ed.
Xbox still has the early release rights like the past, and non premium players will get them every 3 months or so. With Xbox getting them earlier than PS3.
I could be wrong, but I believe that with premium elite we will get a couple new maps every month, at the minimum premium players will get them earlier than non premium players.