The PlayStation Mobile DevPortal launched today, which Sony hopes will encourage developers to begin making and selling PS Mobile titles on the PlayStation Store.
In order to sell your creations on the PlayStation Store you'll need to pay an annual fee of £65 for the PlayStation Developer Program Licence.
The PlayStation Mobile SDK, available for download now, runs on PCs and allows you to test your code either in the provided simulator, or on a PlayStation Vita or PS Certified mobile device.
With a single codebase, your creation will be playable on all PlayStation Certified devices, including the PlayStation Vita, with no rebuilding necessary.
Source: EU PS Blog