Sony is in all probability planning on the new PlayStation 5 (PlayStation 4 design is probably finished by now). Still PlayStation 2 hasn’t lost it’s touch with the 50th million unit now sold to someone in the US. Those 50 million units is just in the US mind you.
Looks like Sony is not stopping the production of the PlayStation 2 just yet. Although it’s competition, the Xbox, has not been around for quite a while, the PlayStation 2 got sold to about 200,000 customers in November of 2008 alone. One reason for this is most definitely the cost of a PlayStation 2 which is about US$ 130 for a new unit compared to US$ 400 for a PlayStation 3.