They were just some diplomatic talking, nothing of serious. It's that the piedmontese nobility had some tie and traditional leaning with France and at the times was still influent. But in reality nothing come from this talking and the many politicians and merchants were not very fond of France.
You mean when Lamarmora was posted in Paris as a special ambassador, by the king (effectively a way of removing him from Florence without sending him away in disgrace). However Lamarmora was not much loved by the government, and in any case all the pour parlers were predicated on Italy getting free hands in Latium, which Nappy could not grant for internal political reasons. There was not any chanc that something might come out of this.
However in the end the Italians (unofficially) fought on the French side. After Sedan and the departure of Nappy for exile, Garibaldi organised an Italian Legion (some 10,000 volunteers) and fought some actions against the Germans on behalf of the republican government. IIRC, he won the only French victory of the entire war (nothing too big, but the French bar in this war was set pretty low