IWC is a division of Richemont, and not even a separate corporate entity. As such its financial results aren't published separately. Richemont, which has a 12 month fiscal year ending on March 31, just published staggeringly good financial results. You can read the Richemont official report byclicking here.
Sales were up 29% and operating profit was up 51% --that's incredibly good. And while Asia did contribute this huge growth, it wasn't all Asia. Asia was up 46% but the Americas were up 30%. Also, while there are no guarantees for the future, April 2012, the last month and right after the fiscal year-end, outperformed April 2011.
I will say that IWC also has had excellent growth in the past year, as you can simply notice from the apparent demand for product. The Boutique strategy has contributed to that growth. It's a hot brand now.