The PS4 will follow a similar sales trend to the PS3

[M.U.G.E.N]

We have no idea if it will follow the same pattern or not. We still have no confirmation on specs, price, features and other services of the system. And most of all the gaming support it has

For it to follow a similar pattern there are many other factors too, including the competition. WiiU, at least for now, is not a competitor on the same level the wii was. We have no idea how the next xbox will turn out too

All in all it's way too early to speculate