Will I be able to quickly jump from one player’s perspective to another?
Yes. You can easily jump from observing one player to another by clicking on the appropriate portrait on the left or right side. Alternatively, each player can be selected from the drop down menu in the bottom left corner.
It should also be pointed out that you can do this by pressing 1,2,3,4,5 to jump to the members one team and Q,W,E,R,T for the members of the other.
(Sorry if this is in the wrong spot, but the spectator mode guys should be able to pass this along to the right web people)