Am I misinformed, or there were going to be one and two handed skills only! So why are we having this sword/axe/blunt pull. And the critical perks are most probalby going to be in the stealth branch for daggers?
You specialize under each skill.
Blade perks give better criticals
Blunt gives armor penetration(ignores armor, doesn't really penetrate)
Axe gives bleeding damage.
You can always get all perks under one or two handed, but that would be a waste.