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I have serious doubts that Apple's 3D Touch will be a huge "success" with users unless there is a hint that touchable components in fact do support it. I am not a UX expert, so the points that I'll bring up are merely based on the little knowledge I have acquired as a design enthusiast and UX aficionado.

1) Recognition rather than recall

In UX this has become a rule that UX experts abide by religiously, so why should it be different with Apple's 3D Touch ? Why/How should users recall that an icon supports 3D Touch ? More importantly, how should they recall which actions are supported by the opening menu? The more intuitive way is to tap an image to enlarge it, right ?

The counter argument is the case of context menus on desktops we know and love (right click components to show actions) such as copy & pasting text. The thing is, that those context menus often do have a predefined set of actions that are universally known (and recalled) by users (e.g. Copy, Paste, Settings), which will probably not be as consistent in iOS apps.

Suggestion towards recognition:

Instead of guessing whether a visual component supports 3D Touch:

Source: http://www.apple.com/iphone-6s/3d-touch/

Steer towards recognition -> Add a visual guide that the component supports it: (The hint icon looks terrible, I know, this is just a quick draw-up for illustrating my point)

enter image description here

Of course this wouldn't make much sense in the case illustrated (as all app icons support 3D Touch by default), but in general (custom built apps that support 3D Touch in their interface).

2) Significant delay in interaction -> hampering UX

From what could be seen in the demos, enlarging an image takes 50ms (?) or more, why would you even bother to hold down to enlarge an image when you can just enlarge it with a tap, which is probably much faster anyway ?

I am looking forward to hearing what experts (or more experienced people) on here think about this.

closed as primarily opinion-based by DasBeasto, Evil Closet Monkey, Joshua Barron, DA01, Devin Sep 10 '15 at 15:03

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    While I like the question, this will lead to primarily discussion and opinion based answers which isn't allowed in this Q&A format. Could you try rewording this into a more "answerable" question rather than just looking for input from the experts? – DasBeasto Sep 10 '15 at 13:16
  • @DasBeasto That's a shame, I was looking to gather as much information in a discussion-like format. I'll try to think about ways to rephrase my question... – the_critic Sep 10 '15 at 13:20
  • yeah I see @DasBeasto point, it's hard to have an evidence-based conversation about a new feature though. I guess there are comparisons to be made between 3D touch and long press...so maybe there are some long press gesture research pieces etc. I guess apple's assumption is that all apps will start to use the feature on their icon e.g. put their primary task and their settings link in menu that appears. In the case of twitter 'tweet, settings'. Maybe the question should be 'is 3D touch just glorified long-press or right-click?' :) I think the thread you've start definitely warrants discussion – Chris Sep 10 '15 at 14:59
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    FYI, this would be a great topic for Chat. – DA01 Sep 10 '15 at 15:53
  • @DA01Where can I find the chat ? Edit: Okay, think I found it. How would I go about asking this ? Should I link this question ? – the_critic Sep 10 '15 at 16:24