Assuming he can ever finish The Last Guardian that is.
I jest, I jest. In an interesting interview with Edge, Ueda revealed that he wants to make a zombie game one day for 'hardware that is based around a touchpad' and that allows him 'to express a character in a lyrical way'.
Other interesting titbits from the interview include his reasoning for departing Sony and going freelance ('in a nutshell it was because I felt a sense of crisis within myself about a lot of things. It’s hard to [say exactly what], but in terms of my own growth and career and so on') and expressing his feeling that Ico and Shadow of the Colossus both came close to how he envisaged them being when he set out to work on the titles ('In Ico’s case the design and in SotC’s the visual look were very close to what I’d imagined').