EDIT: As for deadlines,it is going to be extended anyway,and it's not like we put those deadlines.They announce them and we wait.
Just tell me it is worth the effort to add "sprinting" to the game when you can already run...-_-;
We have no way of knowing it will be extended or not. We might be able to make a rough assumption based on Oblivion's development, but that would have literally no foundation.
In regard to sprinting, I don't know if it's worth the effort or not; I haven't experienced the overarching system in which it might be used, and I therefore have absolutely no time or context to judge how good or bad it is.
In fact, let's just repeat that for the topic at hand, in a less-subjective format:
No one has experienced the overarching system in which [Insert Likely Ommision Here] / [Insert Disputable Mechanic Here] might be used, and therefore everyone have absolutely no time or context to judge how good or bad it is.
I loved spears in Morrowind. But I also explicitly stated that I wanted a game that would surpass Morrowind. And it is by no means required that a game reuse anything at all in terms of mechanics from Morrowind to do that.
And any argumentation about the USE or FUN of spears is pretty pointless. Obviously they are useful, and virtually any mechanic, done right, can be made fun. It instead boils down to implementation-time related to the level of direct constistency with a narrowed centric theme. That is what will determine spears/crossbows/what-have-you, and very little else.