I think Juventus will definitely be making some waves again in January. I was a little disappointed that they didn't sign another CB before the deadline, but I think it was because Ranieri didn't want to overwhelm the squad with changes, as this period was huge in turnover, relatively speaking.
However, seeing the first 3 games, there's no way they can stand pat in January with that defense. Chiellini and Andrade are the only two defenders consistently playing well. Salihamidizic was solid on RB though as well. Criscito is pretty hot and cold, which tells me he's not ready to start every match. Zebina and Grygera have been unconvincing so far. Legrottaglie is (unfortunately) the best of the rest. That spells trouble.
Priority 2 is another unassuming 5th choice striker, preferably a finisher like Trez, but someone low-key enough to not care that they won't play a whole lot.
Ideal signings:
CB: Cannavaro, Meira, Dainelli, Zauri, Zaccardo, Zapata
FW: Spinesi, Saudati, Zampagna