Its far too early to say. Anyone "buying" at this point is doing so based on name alone.
Yes i will buy if there are subscriptions, if its F2P and B2P probably not. Overall i just hope that the Adventure Zones are ready at launch.
Yes I am buying the retail box (collector's edition) for my collection, so I'll at least try the game. Future subscription depends on whether I like the game, I really want to, but who knows...