Look, there is simply no chance that Apple is going with flat UI and color coded icons. The changes wont be extreme, Apple is not going to fire their graphics department so they can implement flat squares. Yes they will get rid of the kitch.

Think how many peoples' apps would break if they went to Flat UI, think how many users they would alienate? Think how iOS is supposed to have some kinship with OS X design ethos. Is anything in OS X flat?

Linen is staying. Drop shadows, gloss and rounded corners are staying.