This explains how smart works a bit better
http://brinkthegame.com/community/blogs/detail/?id=4
"As a player runs around levels, we check for these invisible reachabilities ahead of them. We then filter down the list of reachabilities based on their position and orientation. Because of the wealth of routes a player could take at any point, we may still be left with more than one choice even after all this culling. We want to make navigation straightforward for the player, but we don't want to launch a player into a move that they didn't intend (a false positive vault when the player wanted to slide, for example).
This is where the SMART button comes in. As well as allowing the player to sprint, the SMART button lets the movement system know you want vaults, slides, wall hops and mantles to automatically engage as soon as you move into the context for one. When there's more than one choice, we use your aim to choose the final decision. Given a railing you could slide under or vault over, looking low will result in the slide, and looking high will result in the vault."
To me this sounds like if you're not holding the SMART button you walk and if you are holding the SMART button you sprint as well as automatically interact with obstacles when you get up to them. You control witch way you use something by the direction you characters is looking. No timing or anything involved you just hold the button down like in Assassins Creed. This however could cause problems, what if I want to slide to avoid enemy fire but I'm not in the context to slide? Will this mean I have to look away from my target all the time because SMART is affected by where I'm looking?
Thankfully it seems you can use manual controls as well rather than the smart button so hopefully that shouldn't be an issue
"you can still use old-style jump and crouch to manually use vaults, mantles, slides and wall hops. It's the combination of SMART and manual movement, however, that gives you the greatest versatility, freeing you to look around easily, and concentrate on bigger concerns. But for a tricky wall jump which could convert a mantle into a much faster vault, you might want to opt for a manual jump to get your timing just right, while still holding SMART to ensure you nail the vault. You're always in control of the automation, and can opt in or out simply by pressing or releasing the SMART button while you move."
IMO the smart button sounds a little cheep since it dose most of the work for you and acts as a 'cover your ass' button when you?re trying to do things manually : /
But I suppose the simpler controls will be better for the consoles (I'm on Pc so I'm use to my games having more things bound to different keys.)
and It might mean the game is more strategy based than reflex and internet speed based since it?s not about pulling of complex button combos which could be a good thing
Course being that I'm not the sharpest knife usually and are currently operating mostly on caffine I could be completely misinterpreting everything I'm reading.