All the MID examples I saw, like this early one:
http://www.itechnews.net/2008/04/18/...pecs-revealed/
...featured 3G.
To me, at least, a WiFi only tablet is a Webpad. Which is an even older spec.
http://www.pcstats.com/articleview.cfm?articleID=476
Now that they're getting cheap, we're finally seeing WebPads take off. Oddly enough, *without* the webpad name. (C.F. Pandigital Novel.) Go figure.