Now I read a little here and there about the possibility of spell weaving, since one can dual wield spells. Is this confirmed, if so, yes or no?

You can combine the same spell, but not different ones.

So wait, can I cast wif two differnt hands two differnt schpells? like boom fire to the right, and boom uhh... ice? to the left

I also heard about the possibility of a perk allowing spell weaving. Any clues on that??

It has been reported that you need a perk (presumably in the Destruction tree) in order to combine two of the same spells into a more powerful version. I imagine the same is true for healing as well.

what I don't understand is why we can't. (its not realistic enough?... magic = realistic?) <-- [if that was their reasoning - it not being realistic]

or possibly bc it would be "Op"

It was probably just a case of being unable to get the mechanic working the way they wanted, or being unable to think of enough spell combination effects to make it worthwhile.

We can't combine different spells because it gets too complex. Sure, combining a flamethrower and ice thrower spell doesn't seem to hard, but what about something like flamethrower and a summon? Or even just flamethrower and an exploding fireball? How do those combine?

There could be a limit, constant effects could combine with constants, instants could combine with instants, summons cannot be combined (although a daedric ghost warrior would be kinda sick)