I'm not sure how the beta will work either as SE hasn't really released any information about it yet. I assume info will be given later this month. Also when the ps3 copy of this game was purchased, a voucher was given for a free copy of ps4 version. A lot of other games did this too or gave a discount (like $10for ps4 version). Since you have a subscription to this game all other mediums are included (PC, ps3, ps4) on the account.