It is more so of late that Apple choses to focus on the different set of features. Or it is a matter of emphasis. However, they do tend to work out many kinks before it leaves.
Except other folks did announce touch screen phones in advance of Apple. LG for instance. Folks knew it was coming along before that. Anyone who was poking around the places where cellphone parts vendors were hocking their future products knew this stuff was coming out also.
http://www.engadget.com/2007/01/18/lgs-ke850-prada-official-iphone-says-wha/
http://www.everyipod.com/iphone-faq...msung-instinct-htc-touch-diamond-lg-dare.html
[ some of these early entries even did video and voice menus. Who copied from whom?????? ]
Apple hasn't been a "first mover" in most areas in a long time. At this point more of a "refine the first mover's effort and out pace them because we have some leverage" at this point. (that includes leveraging the rubbish patent system, by the way.) Can perhaps tad them as innovators for evolving products along lines that the originals missed, but blazing brand new paths types of innovators .... not really.
Apple's not Xerox PARC or Bell Labs or IBM Reasearch like in that kind of depth of innovation.
In that second mover context, may actually need to stalk new areas more quietly since they'd know Apple was coming.