As a Windows Phone user (Lumia 925), this makes me happy. There are so many apps people with I-Phones use, that just aren't available on Windows Phone, and the alternatives available frequently are of no use (particularly for social apps).

I know that Ballmer wanted Android apps for Windows phone, but if Islandwood works out and I-Phone apps become available for Windows Phone, then Ballmer can suck it. That will be good enough, and won't require re-writing Windows Phone OS in order to implement it, like the bridge to Android apps would.