After scouring more forums and their speculation I have copied n pastes some here.
It seems being able to change characters may be there.
Noel is attacking in the game but on the health bar side he is below Serah while in XIII the leader was always at the top of the health bar.
Next there seems to be no stagger bar at the moment, either thats because its very early in the game (but XIII's first enemy had a stagger bar) or its not there anymore....if this is true the entire idea of the whole battle system changes as the point was to change paradigms, build up the stagger bar and then do massive damage.
The "count 2" thingy that popped up may be a combo done with other characters in your team if you time your attacks...but this isn't possible unless you control more than one character in a wait type battle system.
Finally the icon with the blue sword could indicate an elemental attached to a weapon or class type....can't assume any more
Thats as much speculation as can be done from these screens which have conjured up more questions than they answered about the battle system.