In PhoneGap/Cordova 3.3 (and 3.2) the preference KeyboardShrinksView for iOS is gone and has been replaced with enableViewPortScale.
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The commit that removes these (see https://issues.apache.org/jira/browse/CB-4978) states:
The Keyboard preferences have been removed from core and put into its own plugin in cordova-labs plugins branch.
I've tracked this down to https://github.com/apache/cordova-plugins/tree/master/keyboard and this fork (?): https://github.com/etiennea/phonegap-keyboard
This should then allow you to use
Keyboard.shrinkView(true)
in your JS to minic the old functionality of KeyboardShrinksView