Is it now grammatically acceptable to say, 'This is a new word for me.'? It just doesn't sound right. Shouldn't it be, 'This is a new word to me.'? Just like when someone says, 'This is a new car for me.' Or , 'This is a new gadget for me.' It simply doesn't sound good, does it?
In eastern Canada I think to is more common than for. So perhaps this usage varies regionally.