Personally, I hate the name "PS4", and I hope Sony doesn't use it. I don't think Microsoft will use Xbox 720, so that doesn't really matter. So, what do you hope they name them?
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PlayStation [i]4[/i] seems unlikely to me. In Japan there is a strong superstition surrounding the number 4, or [i]shi[/i], which also means [i]death[/i]. It's comparable to the US where you don't have many buildings with a 13th floor, amirite?