A reddit post by John Smedly has thoughts from the SOE boss to changes in how premium memberships work in their MMOGs (thanks Gamasutra). At the end he reveals they are also considering a single consolidated premium subscription plan that would grant access to all their games:

We are considering (and are likely going to move forward with) a plan that means if you subscribe to one of our games you are a subscriber to all our games (this applies to PC titles only btw).. all for the current $14.99 a month. That's a benefit most companies simply can't offer because they don't have our portfolio of games. The goal would be to let you pick an item in each game you play. Some of you might say "well who cares..I only play Planetside 2. How is that a benefit to me?" My answer is simple - we've got a great lineup of games, some of which aren't announced yet that cater to a lot of players. We have EQN and EQNL coming along with other..... games... that PS2 players might just like :)