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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I kinda like the way Borderlands does it, where you have three skill trees, only enough levels (and skill points) to get through one and a half, and you equip class mods (specializations) that enhance skills you've chosen and different stats. It allows for a ton of variety within each class. Regardless, I trust Bungie and I'm sure whatever they've come up with will be better than our wildest dreams. I just wish they would tell us already! I'm incredibly impatient.