Taepsilum's assertions that you won't need a new computer are, perhaps, bold. Gamespot has picked up on them for an article, and asserts that you "probably" won't need a new machine. This is accurate, with the key word being "probably". If you're currently only able to run the game at 8FPS on Low settings, it's pretty likely that Warlords of Draenor will push your system over the edge.
Let's be realistic here. World of Warcraft has pretty amazing performance on older machines. A little while ago I asked on Twitter about players running it on low-spec systems, and it will let you run the game on some pretty archaic specs. Performance is about what you can do with the game, and is subjective. I'm happy with the graphical quality I get out of WoW on my machine, but to friends with higher level systems, it looks awful.
Filed under: Warlords of Draenor