Will it be possible to develop for the PSP vita?

The PSP vita is sony's newest version of the PSP and there are a ton of cool features on it and that's why I want to develope for it. But is it going to be possible? If not when do you think it will be possible? I also have another question, how hard do you think it is to develop for PS3 / Xbox, I see that only one game has been created for the PS3 so I'm guessing it's a hard task.