That would be Gaël Fickou. He's in the squad, but he's unlikely to play the first two matches unless there is an injury. He's only 18, he has a lot of talent, but sometimes he tries too hard. He's pushed Yannick Jauzion and Yann David to the bench for Toulouse already. He's playing 13 for Toulouse (though wearing 12), but I think his future is at inside centre for France.
The other uncapped players in the squad are: props Eddy Ben Arous (21 years old, Racing Métro) and Yannick Forestier (30yo, Castres), locks Jocelino Suta (28 yo, Toulon) and Sébastien Vahahaamaina (21yo, Perpignan), backrower Pierrick Gunther (23 yo, Toulon), fly-half Jules Plisson (21yo, Stade Français) and winger Vincent Martin (20yo, Toulon).
Suta and Forestier are rather old, so I think they were called because they were needed, the rest I think won't play much, except Gunther, who may even start against Australia.
He's a hard running, hard tackling flanker, who's also very good at lineouts. I think we will see a lot of him in blue, I just hope he keeps playing for Toulon now that Fernandez Lobbe and Van Niekerk are back.