Worry Not - The Playstation Network Is To Remain Free.

Kaz Hirai (via VG247) quashed these reports, ensuring that the PSN is to remain free to use, with subscriptions for "premium content" to be introduced.
“SCE will further increase sales by offering users new entertainment through the combination of hardware, software, peripheral and PlayStation Network,” said SCE boss, Kaz.

“Especially in the online area, we are studying the possibility of introducing a subscription model, offering premium content and services, in addition to the current free services.”</blockquote>

We're assuming subscriptions might include a PSPgo rental service.