Things should look like what they are. A computer display is not leather, so it should not look like leather. Making it look like leather is low-brow kitsch, like a fake electric fireplace or fake electric arc candles.
I hope Apple doesn't pursue the flat UI route a la Microsoft, not only is it not to my taste, but the use of subtle lighting effects have legitimate uses as cues to the user that an element is a button and can be pressed for example. Clearly this is not skeuomorphism as it's not a frivolous accessory but an aid for the user to understand the UI. This is not new either, buttons have been beveled since Mac OS 8 and Windows 3.0!
Essentially I think Apple will ditch the revolting skeuomorphism e.g. leather skinned apps, and continue to use subtle lighting effects and gradients to augment their UIs, and if they are truly planning a radical departure you can bet that it will be something rather original and not simply following Microsoft's lead. That is not Apple's DNA.
For non-touch and complicated UIs, it's a lot less useful. See Office 2013's mess of a UI, which also added ALL CAPS as a design element that literally conveys zero information (there's no common trait caps has across the applications, it's purely a random design change for the sake of some really poor design sensibilities).