According to a pdf document released by SCEE, Sony is charging less to the Mini Devs. Everything which is released on the Playstation Network is charged a fee of 0.16$ per gigabyte.
There will also be no limitations on the number of games released by the developers on the PSN, so that means we can expect a lot of the games from the same publisher and may be in the same month itself. This is certainly good news for Playstation Network fans. But no region has been specified, We believe its Europe only since its a SCEE document.