There have been several interesting takes on a talent tree or skill progression in gaming over the last few years.
Path of exile comes to mind for a long term player progression.
The instant changeability of the Diablo III system
The 3 tree version that WoW uses
What would you like to see, and how would you like it implemented?
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As much as The Old Republic did wrong, one thing I did like was the skill tree system. You would pick a class and somewhere along the skill tree progression you picked a specialization. Hypothetically, in Destiny you could choose the assault class, a regular ground pounding foot soldier for starters with a few general abilities, but after a while you are asked to commit to either the medic spec with healing abilities or the vanguard spec with shielding abilities for tanking (examples). This would promote class distinction and diversity by effectively doubling the possible classes for the player to choose.