At 1:43 of the new trailer the player is charging up a spell. I appears as though it is coming from both hands. Is this possibly what happens when you equip the same spell to both hands? It is very DBZesque to me, and I like it!
That's what they have said you can do. Right now you can only combine two of the same spell I believe, no multi effect spell from two different spells. We will still be able to cast each hand independently I suppose...a summon and fire spell for example.
I am not certain what he's casting though, it almost looks like a fire shield to me.