Well… it seems like there will be a 19” iMac coming out by the end of this year. This inquirer article says that Apple has asked a Taiwanese company to start producing the screens for use in new iMacs. Rumor is that the 15” iMacs are being phased out too.
I just bought my wife the 17” iMac last week. If this article is true, then I only have one thing to say: @&!%*!#!!