if sony is smart, they won't let dumb gamers and media who have no business sense, pressure them into releasing a new console for at least another three years. they just started turning a profit on the ps3 and it would be dumb to render it obsolete as soon as it starts making money. the 360 has hit it's limit and is at the end of it's cycle so it make sense to release a new xbox, but i think the ps3 still has a lot of life in it, and still has unfulfilled potential.
if i was in charge of sony, i'd continue focusing on the ps3 and let microsoft go to war with nintendo's wiiu, while quietly having developers work on ps4 games so when i'm ready to release the ps4, i have a strong system selling line up.
i'd then wait til after nintendo and microsoft have dropped their big exclusive, and are exhausted to release the ps4.