Microsoft is working towards a public preview version of Windows Blue. Sources familiar with Microsoft's plans have revealed that the software giant is aggressively targeting a summer launch date for Windows Blue, ensuring its development cycle is short. Microsoft recently passed Milestone 1 for Windows Blue, but the company is now readying a Milestone Preview which will form the basis for a public preview
The public preview, first reported by win8china, will launch within the next few months, allowing existing Windows 8 users to test and provide feedback before Microsoft readies the final version of Windows Blue. We understand that Microsoft is aiming to only have one preview release for Blue. Features are still being prepared for Blue, but one of the biggest changes is an improvement to the search charm functionality.