So, then let us cross out two of them and it would have to be right...   
  
 
 
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Akari has just said that we revisit a couple of planets from the first game. We know about Dantooine so I guess Korriban is the other. 
  
I'm dubious about Haruun Kal, as I think that two jungle worlds would be too similar. HAR may refer to an off world location e.g. HARbour, or dificulty setting (HARd) 
  
I think the evidence is stronger for Nar Shadda than Coruscant, and I doubt there will be two city worlds for the same reason as I doubt there will be two jungle worlds. 
  
My final (for now) seven: 
Peragus 
Telos 
Dantoone 
Duxn 
Onderon 
Korriban 
Nar Shadda