where is halo 4 going?

Know that we know what are the AA’s and perks or what ever you want to call them.
How would like to see them used in Halo 4?
Example sprint does it 4 secounds or 10 secounds or even vary it over different maps.
Also know that we have mid game join up its going to be pain to join mid game but its also pain when you are the only person left on a team against 6 or 8 opposing players.

Different from all above simply means not a rehash of any game but reboot