HP may own the patent for printing to shared printers from a mobile device...
http://www.freepatentsonline.com/7636584.html
here's my take on this:
apple convinced hp to develop proprietary hardware to work w airprint, then hp discovered in dev releases that printing via printer sharing to any old printer was also enabled, rightfully scaring hp into thinking who would buy another printer when they can use any existing one now with share printing... hp complains to jobs, jobs says ok, we'll cripple printer sharing from ios for the timebeing to let the new hp printers get a wee foothold...
that's my bet. i understand it, but it isn't consumer friendly. airprint via shared printers will be back, i have no doubt, but perhaps we'll see a small window where hp can recoup some r + d costs... (or at least sell the million airprint printers they've already made!)
my 2¢.
I secretly hope one can never print easily from an iPad. I have 140 laser printers, and the yearly costs on them is more than most school's tech budgets, and I want it to go away. Forever. This shouldn't be the domain of the iPad. Go green, go cloud. There is rarely a real reason to print anything, at least in EDU. We are totally electronic NOW....
The last 10.6.5 seed removed airprint functionality for shared printers. That is considered proof.
As an Apple Developer, I have the GM 4.2 release on my iPad and I can't seem to find any indication of AirPrint. There is nothing in the settings and no icons. Maybe I'm just missing something.
Apple and the printer industry need to work together to make Air Print work on current or slightly older machines - say a year or two old at least. This notion that users have to go out an buy (at a premium) another printer that will work with their iPad, while throwing their old printer onto the garbage heap is unacceptable! Not only is it enviromentally irresponsible but unfair to cash strapped consumers looking to save their hard earned money!How about software that you can load onto your old printer that will allow it to work with iPad available at a more reasonable cost?