Thanks everybody.
I think that grammar books tend to say that the progressive aspect implies that the action is taking place now. In cases like this, where the action is not going on at this very moment, the progressvie would imply an "enlarged" now and therefore temporariness.
But in the case of this sentence, even TDOL, who mentions the temporariness, says that the sentence COULD imply it. So I think, one can stick to that, unless TDOL disagrees and sees a necessary implication of temporariness.
Perhaps the English language has undergone some change regarding the implications of the progressive.
As for the temporariness, check:
1-I am living in Paris.
2-I live in Paris.
Here I think temporariness is obviously and unambiguously implied (in 1).