This whole Nalu thing was referring only to tartaros arc that Nalu won't get that scene during that arc ( in the episodes past 258 )...
this Vol.8 covers episodes 255-258 < if i'm correct and the interview this interview was recorded during making of tartaros arc and can be added like a Bonus into that Vol. ( you get that sometimes when you buy a DvD something like interview with actors, funny moments etc. :P )
So this interview was probably recorded September/August past ( judging by dates of episodes released..) .And Hiro i think later mention that he want to add more Romance into the story.
So as i was saying yesterday just chill out and wait for big moment that will come