First, let me just say that I love the idea of a ranged Rogue spec. I really, really want to play with a bow and without a pet.
BUT...IF that is not to be. Then, I would like to see one of the Rogue's specs become a Blademaster type archetype. 2H Sword + Stealth = Win. And I want to look exactly like Ezio as I do my thing.
As far as mechanics go... I hate that so much stuff is tied into combo finishers. I'd much rather apply a poison and a bleed manually as combo generators. And then have one single big finisher. That seems like it would be more interactive than what we have now.