An iPad Nano may be quite unlikely in 2010, but the possibility is real, according to a recent Digitimes rumor [1]:

The sources noted that Apple has recently placed new iPad orders to Taiwan-based component makers for the fourth quarter of 2010 and the first quarter of 2011 with 9.7-inch, 5.6-inch and 7-inch models all included.

Admittedly, the same report notes that supply of OLED screens is limited, and may not ease until the second half of 2011.

[1] http://www.digitimes.com/news/a20100713PD207.html

iPad Nano? Isn't that already available? (iPod touch / iPhone)

Yes, that was the joke.

Apparently it was either not funny enough or not obvious enough.

I voted you up, but jokes are usually off topic on hacker news and get voted down pretty quickly no matter how funny.