Looking Ahead to 6.0

via Wowhead

You should really check out Wowhead's guide to 6.0 as there are a bunch of things going away that you might want to get/capitalize on before the patch, including:

  • Mounts
  • Battle Pets
  • Hunter Pets
  • Spells
  • Transmog
  • Titles
  • Valor and Justice Points
  • Achievements 

You might also want to check out WoW Insider's posts on 6.0 changes.