Preview at WWDC likely in June, followed by September launch.
Google Chrome Browser, Google Drive Coming to iOS [Now Available]
The biggest hurdle that Chrome features, of course, is that it cannot be set to be the default browser on iOS devices, a capability that Apple also reserves for Safari. So, while you can use the browser to your heart’s content, it will not be the default handler for any URLs clicked. That’s a huge hurdle to overcome.
Google Drive -- the DropBox competitor released earlier this year -- also gained an iOS client. [App Store]
Update: Chrome for iOS is now live on the App Store. [Direct Link]