Sony has launched the PS Mobile Dev Portal to help developers get started working on PS Mobile. The official SDK is available through this portal, as is the license agreement.
A fee of only $99 is required for a developer, and this gives them the ability to publish as many PS Mobile games as they'd like for one year on PlayStation certified devices.
What this means for you, gamer, is that the PS Mobile library of games will grow. A low barrier of entry will surely bring in plenty of talent.
Hopefully someone will make the corgi adventure game I've been dreaming about.