Just over a month ago, I wrote (paraphrased) it was inconceivable that Steve Jobs was done. While fate has since robbed him of the pleasure of carrying out his plans personally, that he had plans for the future is certain (corroborated by Eric Schmidt), and that he was well aware he might not be around to see them through is just as certain. Some such plan may be laid out in his will, and there may be some hint of it in his official biography, but given his belief in the necessity of secrecy it's unlikely that the whole plan can be found in any combination of public sources.
That he had the means available to set something significant in motion is also certain, between his personal wealth and the array of people with whom he had strong personal connections. That he had the vision to do so should be apparent from his record at Apple, NeXT, and Pixar.
It's also likely that his plans don't particularly revolve around Apple, not because he'd run out of ideas for the company, but because it became necessary to turn over control of the company to others, and apart from perpetuating the culture that made the company so successful in the first place, he wouldn't want to constrain their freedom to respond to evolving technology and market conditions. Also, his $6 Billion would scarcely make a dent in the prospects for Apple, paling as it does in comparison with the company's cash reserves, but turned in some other direction it could make a huge difference, invested carefully, and still secure the financial future of his family.
So, while I can barely finish writing this through the tears, I'm still expecting something insanely great from the mind of Steve Jobs, perhaps even something that will capture the imagination of millions and change the world more profoundly than anything he lived to carry through himself.