This is a very interesting turn of events. What's going to happen now? I don't think it's going to be some kind of corny "I thought I killed you! Prepare to fight for no reason!" moment. I think there's the very real possibility that we're going to see some serious character development for Sasuke in the coming chapters.
Itachi is on a mission to stop Edo Tensei. I don't think he's going to stop to fight if he knows it will delay his mission or cause him to fail it. He will try to escape from Sasuke if it looks like Sasuke wants to fight. I don't think Sasuke will want to fight, however.
There are really two options here:
First, Sasuke goes crazy and tries to re-kill Itachi. this proves that Sasuke is a monster all the way to the core and that he will eventually kill Tobi and/or Kabuto and become the main villain.
Second, Sasuke asks Itachi some questions about why Itachi chose to murder the Uchihas, why he didn't stay to be a big brother and role model, etc. This leads to Sasuke having a change of heart and eventually teaming up with the good guys against Tobi/Kabuto/Madara.