Wunala is a 744 so it is not being replaced. Nalanji is a 743 and will be replaced along with the other Classics. First to go will be the SPs (replaced by A333s), then the rest by a combination of 744LRs (which will release older 744s onto existing Classic routes)and A333s.
Classics fly to Asian ports such as Taipei, Japan, Manila etc and New Zealand as well as the MEL-Rome route which is operated by a 743. I don't think they fly them to HNL or Tahiti anymore but did so until recently.