When will the PS4 release?

[Alby_da_Wolf]

Spring 2014 in Japan, to avoid conceding an excessive head start to Wii U there and to exploit Golden Week 2014.
Q4 2014 in the rest of the world, where a launch would work better in that season.

Edit: @Dodece:

Applying strictly your reasoning, they won't ever launch any new product anymore.