Federico Viticci on the biggest need for iOS:
I could discuss ideas for inter-app communication on iOS for hours, but I’d like Apple to start from the basics and iterate from there. Look at how apps can open a Mail compose window now, or how you can create a Calendar event from email messages.5 Those are essentially app features made available to other apps with no manual switching required: imagine if, again, a user could configure actions available in Safari, Mail, or other apps through this system. Combined with a UI for picking files from apps, iOS could be better suited for productivity tasks and general sharing actions than it is now.
I'd put the need for this on par with the need for copy and paste back when then iPhone launched. Apple simply cannot ignore this any longer. Something must be done.