Course the trailer opened up with the Nintendo Network logo so who knows what the plan for it is. I'm really hoping it has local splitscreen.
As for map jumping, did they say you can jump anywhere or do you tap on a teammate? I thought I heard the latter but could've misinterpreted it. If the latter it could be binded to some unused buttons, like one to cycle through teammates and another to map jump. Or if the former I guess a map toggle hold button and cursor/pointer to pick a jump point...crappy with analog sticks but would be somewhat quick with the remote pointer.
Edit: read some impressions saying you tap on a teammate, so cycle+jump button scheme should be possible.
Yeah I guess that could be possible, maybe use the right stick button? I doubt this game will have melee attacks anyway.