Prada is always a favored source of newness, with trends typically lasting well after they first march down the runway (see: 3 button blazer). For Fall 12, it seemed that the focus shifted to collar interest. Most forward were the high Edwardian collars which consisted of at least 3 layers.
But perhaps a more easily-adapted trend came in the form of contrast oversized collars which landed on coats.
Yet another point of difference is featured at Bottega Veneta, where contrast point collars appear on woven shirts.