Maybe over the course of the game, more subclass blocks will appear? It's before the beta, so I can be hopeful.
On another note, I hope we can at least switch blocks. Permanent choice would be awful.
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Anything is possible although I would not hold my breath. Luke Smith and Mark Noseworthy briefly touched on this subject when they were on IGN's Fire team Chat, they did mention that they ditched Intelligence, Discipline and Strength [u]and[/u] they were streamlining character class perks in order to make it easier for all players to get an optimal class build.
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You can switch freely between the perk clusters