will this be open world like assassins creed or will it give you a area to play in and can not leave it untill your task is complete

like if i wanted to explore other parts will i have to wait
or could i say well ill kill him later


also i been looking around *maybe i forgot or just did not see it*
but what is the story about exactly
all i have seen is he is a killer
but whats the back ground
i mean even hit man had some back ground to it

I believe we already have quite a few topics on this.

This http://www.gamesas.com/topic/1410530-how-sandboxy-is-this-game/ should help you out.