I've been over this a few times, but I'll note it again. Jagex goal is to make money...that may be by advertisements or subscribers...Jagex can make just as much on advertisements as they make on subscribers...and visa versa. The goal is to run it like a bank. You want a constant flow with at least a slight growth of new players. You also want a fairly stable number of subscribers. Now the subscribers to stay the same...many leave after they get board...thus Jagex needs to fill those voids. But Jagex could also have too many members. If they choose to make the game to propriatary they could easily lose their huge free to play base from whom they draw so much of their future members. Also, if Jagex doesn't have enough free to play members they can't sell as much advertisement space...and people won't buy anyway because their comercial is being seen by less people. So the goal is to have a balenced number of members and nonmembers (mind you that does not mean the same amount...just two relatively stable ammounts with slight growth in both).

With all that said...why do you care? Whether you know something is to be released the day before the release or two weeks before...you can't do anything about it anyway till it actually is released.