I'm rather confused that Google seems to be aiming to fragment the browser market for its own platform. I already wasn't looking forward to supporting/testing both Browser and Firefox on Android... Is Google just this disorganized internally?
Chrome and the old Android browser are both based on WebKit. Google will almost certainly make Chrome the default browser for new editions of Android, and will likely push for it on IOS and Windows phone.
The license doesn't allow a different browser on iOS unless it uses Apple's Webkit anyway. Opera Mini was a technical exception. Every other browser is Safari, just with a different chrome.
Unless you think Google can negotiate exceptions to Apple's and Microsoft's respective store rules (or, more impressively, convince them to change the rules), we're not going to see Chrome for iOS or Windows Phone anytime soon (if ever).
