Following are a number of back-translations as well as a sample translation for translators of Isaiah 48:6:

• Kupsabiny: “You have heard the words that I said to you.
  Have you not see when those things were fulfilled?
  From now on I shall show you new things
  that are hidden that you have not heard.” (Source: Kupsabiny Back Translation)
• Newari: “You have heard these things, look at all these matters, investigating them carefully!
  Will you not admit them?
  "From now I will tell a New New thing
  and hidden things which you do not know.” (Source: Newari Back Translation)
• Hiligaynon: “You (plur.) have-heard what I have-prophesied and you (plur.) have-seen the fulfillment of-it, but you (plur.) will- not -accept that I am the one-who-did it. From now on I will-tell you (plur.) the new things which I have- not yet -reveal to you (plur.); you (plur.) have- not -known -yet.” (Source: Hiligaynon Back Translation)